# --- Standard Library Imports ---
import sys
import os
import time
import queue
import traceback
import html
import http
import json
import re
import subprocess
import datetime
import requests
import unicodedata
from collections import deque
import threading
from concurrent.futures import Future, ThreadPoolExecutor ,CancelledError
from urllib .parse import urlparse 

# --- PyQt5 Imports ---
from PyQt5.QtGui import QIcon, QIntValidator, QDesktopServices
from PyQt5.QtWidgets import (
    QApplication, QWidget, QLabel, QLineEdit, QTextEdit, QPushButton,
    QVBoxLayout, QHBoxLayout, QFileDialog, QMessageBox, QListWidget, QRadioButton,
    QButtonGroup, QCheckBox, QSplitter, QGroupBox, QDialog, QStackedWidget,
    QScrollArea, QListWidgetItem, QSizePolicy, QProgressBar, QAbstractItemView, QFrame,
    QMainWindow, QAction
)
from PyQt5.QtCore import Qt, QThread, pyqtSignal, QObject, QTimer, QSettings, QStandardPaths, QUrl, QSize, QProcess, QMutex, QMutexLocker

# --- Local Application Imports ---
from ..services.drive_downloader import download_mega_file as drive_download_mega_file ,download_gdrive_file ,download_dropbox_file 
from ..core.workers import DownloadThread as BackendDownloadThread
from ..core.workers import PostProcessorWorker  
from ..core.workers import PostProcessorSignals
from ..core.api_client import download_from_api
from ..core.manager import DownloadManager
from .assets import get_app_icon_object
from ..config.constants import *
from ..utils.file_utils import KNOWN_NAMES, clean_folder_name
from ..utils.network_utils import extract_post_info, prepare_cookies_for_request
from ..i18n.translator import get_translation
from .dialogs.EmptyPopupDialog import EmptyPopupDialog
from .dialogs.CookieHelpDialog import CookieHelpDialog
from .dialogs.FavoriteArtistsDialog import FavoriteArtistsDialog
from .dialogs.KnownNamesFilterDialog import KnownNamesFilterDialog
from .dialogs.HelpGuideDialog import HelpGuideDialog
from .dialogs.FutureSettingsDialog import FutureSettingsDialog
from .dialogs.ErrorFilesDialog import ErrorFilesDialog
from .dialogs.DownloadHistoryDialog import DownloadHistoryDialog
from .dialogs.DownloadExtractedLinksDialog import DownloadExtractedLinksDialog
from .dialogs.FavoritePostsDialog import FavoritePostsDialog
from .dialogs.FavoriteArtistsDialog import FavoriteArtistsDialog
from .dialogs.ConfirmAddAllDialog import ConfirmAddAllDialog

class DynamicFilterHolder:
    """A thread-safe class to hold and update character filters during a download."""
    def __init__(self, initial_filters=None):
        self.lock = threading.Lock()
        self._filters = initial_filters if initial_filters is not None else []

    def get_filters(self):
        with self.lock:
            return [dict(f) for f in self._filters]

    def set_filters(self, new_filters):
        with self.lock:
            self._filters = [dict(f) for f in (new_filters if new_filters else [])]


class PostProcessorSignals(QObject):
    """A collection of signals for the DownloaderApp to communicate with itself across threads."""
    progress_signal = pyqtSignal(str)
    file_download_status_signal = pyqtSignal(bool)
    external_link_signal = pyqtSignal(str, str, str, str, str)
    file_progress_signal = pyqtSignal(str, object)
    file_successfully_downloaded_signal = pyqtSignal(dict)
    missed_character_post_signal = pyqtSignal(str, str)
    finished_signal = pyqtSignal(int, int, bool, list)
    retryable_file_failed_signal = pyqtSignal(list)
    permanent_file_failed_signal = pyqtSignal(list)

class DownloaderApp (QWidget ):
    character_prompt_response_signal =pyqtSignal (bool )
    log_signal =pyqtSignal (str )
    add_character_prompt_signal =pyqtSignal (str )
    overall_progress_signal =pyqtSignal (int ,int )
    file_successfully_downloaded_signal =pyqtSignal (dict )
    post_processed_for_history_signal =pyqtSignal (dict )
    finished_signal =pyqtSignal (int ,int ,bool ,list )
    external_link_signal =pyqtSignal (str ,str ,str ,str ,str )
    file_progress_signal =pyqtSignal (str ,object )


    def __init__ (self ):
        super ().__init__ ()
        self .settings =QSettings (CONFIG_ORGANIZATION_NAME ,CONFIG_APP_NAME_MAIN )
        if getattr (sys ,'frozen',False ):
            self .app_base_dir =os .path .dirname (sys .executable )
        else :
            self.app_base_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
        self .config_file =os .path .join (self .app_base_dir ,"appdata","Known.txt")

        self .download_thread =None 
        self .thread_pool =None 
        self .cancellation_event =threading .Event ()      
        self.session_file_path = os.path.join(self.app_base_dir, "appdata","session.json")
        self.session_lock = threading.Lock()
        self.interrupted_session_data = None
        self.is_restore_pending = False
        self .external_link_download_thread =None 
        self .pause_event =threading .Event ()
        self .active_futures =[]
        self .total_posts_to_process =0 
        self .dynamic_character_filter_holder =DynamicFilterHolder ()
        self .processed_posts_count =0 
        self .creator_name_cache ={}
        self .log_signal .emit (f"ℹ️ App base directory: {self .app_base_dir }")

        self.app_base_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
        self.persistent_history_file = os.path.join(self.app_base_dir, "appdata", "download_history.json")
        self .last_downloaded_files_details =deque (maxlen =3 )
        self .download_history_candidates =deque (maxlen =8 )
        self .log_signal .emit (f"ℹ️ Persistent history file path set to: {self .persistent_history_file }")
        self .final_download_history_entries =[]
        self .favorite_download_queue =deque ()
        self .is_processing_favorites_queue =False 
        self .download_counter =0 
        self .favorite_download_queue =deque ()
        self .permanently_failed_files_for_dialog =[]
        self .last_link_input_text_for_queue_sync =""
        self .is_fetcher_thread_running =False 
        self ._restart_pending =False 
        self .is_processing_favorites_queue =False 
        self .download_history_log =deque (maxlen =50 )
        self .skip_counter =0 
        self .all_kept_original_filenames =[]
        self .cancellation_message_logged_this_session =False 
        self .favorite_scope_toggle_button =None 
        self .favorite_download_scope =FAVORITE_SCOPE_SELECTED_LOCATION 

        self .manga_mode_checkbox =None 

        self .selected_cookie_filepath =None 
        self .retryable_failed_files_info =[]

        self .is_paused =False 
        self .worker_to_gui_queue =queue .Queue ()
        self .gui_update_timer =QTimer (self )
        self .actual_gui_signals =PostProcessorSignals ()

        self .worker_signals =PostProcessorSignals ()
        self .prompt_mutex =QMutex ()
        self ._add_character_response =None 

        self ._original_scan_content_tooltip =("If checked, the downloader will scan the HTML content of posts for image URLs (from <img> tags or direct links).\n"
        "now This includes resolving relative paths from <img> tags to full URLs.\n"
        "Relative paths in <img> tags (e.g., /data/image.jpg) will be resolved to full URLs.\n"
        "Useful for cases where images are in the post description but not in the API's file/attachment list.")

        self .downloaded_files =set ()
        self .downloaded_files_lock =threading .Lock ()
        self .downloaded_file_hashes =set ()
        self .downloaded_file_hashes_lock =threading .Lock ()

        self .show_external_links =False 
        self .external_link_queue =deque ()
        self ._is_processing_external_link_queue =False 
        self ._current_link_post_title =None 
        self .extracted_links_cache =[]
        self .manga_rename_toggle_button =None 
        self .favorite_mode_checkbox =None 
        self .url_or_placeholder_stack =None 
        self .url_input_widget =None 
        self .url_placeholder_widget =None 
        self .favorite_action_buttons_widget =None 
        self .favorite_mode_artists_button =None 
        self .favorite_mode_posts_button =None 
        self .standard_action_buttons_widget =None 
        self .bottom_action_buttons_stack =None 
        self .main_log_output =None 
        self .external_log_output =None 
        self .log_splitter =None 
        self .main_splitter =None 
        self .reset_button =None 
        self .progress_log_label =None 
        self .log_verbosity_toggle_button =None 

        self .missed_character_log_output =None 
        self .log_view_stack =None 
        self .current_log_view ='progress'

        self .link_search_input =None 
        self .link_search_button =None 
        self .export_links_button =None 
        self .radio_only_links =None 
        self .radio_only_archives =None 
        self .missed_title_key_terms_count ={}
        self .missed_title_key_terms_examples ={}
        self .logged_summary_for_key_term =set ()
        self .STOP_WORDS =set (["a","an","the","is","was","were","of","for","with","in","on","at","by","to","and","or","but","i","you","he","she","it","we","they","my","your","his","her","its","our","their","com","net","org","www"])
        self .already_logged_bold_key_terms =set ()
        self .missed_key_terms_buffer =[]
        self .char_filter_scope_toggle_button =None 
        self .skip_words_scope =SKIP_SCOPE_POSTS 
        self .char_filter_scope =CHAR_SCOPE_TITLE 
        self .manga_filename_style =self .settings .value (MANGA_FILENAME_STYLE_KEY ,STYLE_POST_TITLE ,type =str )
        self .current_theme =self .settings .value (THEME_KEY ,"dark",type =str )
        self .only_links_log_display_mode =LOG_DISPLAY_LINKS 
        self .mega_download_log_preserved_once =False 
        self .allow_multipart_download_setting =False 
        self .use_cookie_setting =False 
        self .scan_content_images_setting =self .settings .value (SCAN_CONTENT_IMAGES_KEY ,False ,type =bool )
        self .cookie_text_setting =""
        self .current_selected_language =self .settings .value (LANGUAGE_KEY ,"en",type =str )

        print (f"ℹ️ Known.txt will be loaded/saved at: {self .config_file }")
        try :
            if getattr (sys ,'frozen',False )and hasattr (sys ,'_MEIPASS'):

                base_dir_for_icon =sys ._MEIPASS 
            else :
                app_base_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
            icon_path_for_window =os .path .join (app_base_dir  ,'assets','Kemono.ico')
            if os .path .exists (icon_path_for_window ):
                self .setWindowIcon (QIcon (icon_path_for_window ))
            else :
                self .log_signal .emit (f"⚠️ Main window icon 'assets/Kemono.ico' not found at {icon_path_for_window } (tried in DownloaderApp init)")
        except Exception as e_icon_app :
            self .log_signal .emit (f"❌ Error setting main window icon in DownloaderApp init: {e_icon_app }")

        self .url_label_widget =None 
        self .download_location_label_widget =None 

        self .remove_from_filename_label_widget =None 
        self .skip_words_label_widget =None 

        self .setWindowTitle ("Kemono Downloader v5.5.0")

        self .init_ui ()
        self ._connect_signals ()
        self .log_signal .emit ("ℹ️ Local API server functionality has been removed.")
        self .log_signal .emit ("ℹ️ 'Skip Current File' button has been removed.")
        if hasattr (self ,'character_input'):
            self .character_input .setToolTip (self ._tr ("character_input_tooltip","Enter character names (comma-separated)..."))
        self .log_signal .emit (f"ℹ️ Manga filename style loaded: '{self .manga_filename_style }'")
        self .log_signal .emit (f"ℹ️ Skip words scope loaded: '{self .skip_words_scope }'")
        self .log_signal .emit (f"ℹ️ Character filter scope set to default: '{self .char_filter_scope }'")
        self .log_signal .emit (f"ℹ️ Multi-part download defaults to: {'Enabled'if self .allow_multipart_download_setting else 'Disabled'}")
        self .log_signal .emit (f"ℹ️ Cookie text defaults to: Empty on launch")
        self .log_signal .emit (f"ℹ️ 'Use Cookie' setting defaults to: Disabled on launch")
        self .log_signal .emit (f"ℹ️ Scan post content for images defaults to: {'Enabled'if self .scan_content_images_setting else 'Disabled'}")
        self .log_signal .emit (f"ℹ️ Application language loaded: '{self .current_selected_language .upper ()}' (UI may not reflect this yet).")
        self ._retranslate_main_ui ()
        self ._load_persistent_history ()
        self ._load_saved_download_location ()
        self._update_button_states_and_connections() # Initial button state setup        
        self._check_for_interrupted_session()

    def get_checkbox_map(self):
        """Returns a mapping of checkbox attribute names to their corresponding settings key."""
        return {
            'skip_zip_checkbox': 'skip_zip',
            'skip_rar_checkbox': 'skip_rar',
            'download_thumbnails_checkbox': 'download_thumbnails',
            'compress_images_checkbox': 'compress_images',
            'use_subfolders_checkbox': 'use_subfolders',
            'use_subfolder_per_post_checkbox': 'use_post_subfolders',
            'use_multithreading_checkbox': 'use_multithreading',
            'external_links_checkbox': 'show_external_links',
            'manga_mode_checkbox': 'manga_mode_active',
            'scan_content_images_checkbox': 'scan_content_for_images',
            'use_cookie_checkbox': 'use_cookie',
            'favorite_mode_checkbox': 'favorite_mode_active'
        }

    def _get_current_ui_settings_as_dict(self, api_url_override=None, output_dir_override=None):
        """Gathers all relevant UI settings into a JSON-serializable dictionary."""
        settings = {}
        
        settings['api_url'] = api_url_override if api_url_override is not None else self.link_input.text().strip()
        settings['output_dir'] = output_dir_override if output_dir_override is not None else self.dir_input.text().strip()
        settings['character_filter_text'] = self.character_input.text().strip()
        settings['skip_words_text'] = self.skip_words_input.text().strip()
        settings['remove_words_text'] = self.remove_from_filename_input.text().strip()
        settings['custom_folder_name'] = self.custom_folder_input.text().strip()
        settings['cookie_text'] = self.cookie_text_input.text().strip()
        if hasattr(self, 'manga_date_prefix_input'):
            settings['manga_date_prefix'] = self.manga_date_prefix_input.text().strip()
        
        try: settings['num_threads'] = int(self.thread_count_input.text().strip())
        except (ValueError, AttributeError): settings['num_threads'] = 4
        try: settings['start_page'] = int(self.start_page_input.text().strip()) if self.start_page_input.text().strip() else None
        except (ValueError, AttributeError): settings['start_page'] = None
        try: settings['end_page'] = int(self.end_page_input.text().strip()) if self.end_page_input.text().strip() else None
        except (ValueError, AttributeError): settings['end_page'] = None

        for checkbox_name, key in self.get_checkbox_map().items():
            if checkbox := getattr(self, checkbox_name, None): settings[key] = checkbox.isChecked()

        settings['filter_mode'] = self.get_filter_mode()
        settings['only_links'] = self.radio_only_links.isChecked()

        settings['skip_words_scope'] = self.skip_words_scope
        settings['char_filter_scope'] = self.char_filter_scope
        settings['manga_filename_style'] = self.manga_filename_style
        settings['allow_multipart_download'] = self.allow_multipart_download_setting
        
        return settings


    def _tr (self ,key ,default_text =""):
        """Helper to get translation based on current app language for the main window."""
        if callable (get_translation ):
            return get_translation (self .current_selected_language ,key ,default_text )
        return default_text 

    def _load_saved_download_location (self ):
        saved_location =self .settings .value (DOWNLOAD_LOCATION_KEY ,"",type =str )
        if saved_location and os .path .isdir (saved_location ):
            if hasattr (self ,'dir_input')and self .dir_input :
                self .dir_input .setText (saved_location )
                self .log_signal .emit (f"ℹ️ Loaded saved download location: {saved_location }")
            else :
                self .log_signal .emit (f"⚠️ Found saved download location '{saved_location }', but dir_input not ready.")
        elif saved_location :
            self .log_signal .emit (f"⚠️ Found saved download location '{saved_location }', but it's not a valid directory. Ignoring.")

    def _check_for_interrupted_session(self):
        """Checks for an incomplete session file on startup and prepares the UI for restore if found."""
        if os.path.exists(self.session_file_path):
            try:
                with open(self.session_file_path, 'r', encoding='utf-8') as f:
                    session_data = json.load(f)
                
                if "ui_settings" not in session_data or "download_state" not in session_data:
                    raise ValueError("Invalid session file structure.")

                self.interrupted_session_data = session_data
                self.log_signal.emit("ℹ️ Incomplete download session found. UI updated for restore.")
                self._prepare_ui_for_restore()

            except Exception as e:
                self.log_signal.emit(f"❌ Error reading session file: {e}. Deleting corrupt session file.")
                os.remove(self.session_file_path)
                self.interrupted_session_data = None
                self.is_restore_pending = False

    def _prepare_ui_for_restore(self):
        """Configures the UI to a 'restore pending' state."""
        if not self.interrupted_session_data:
            return

        self.log_signal.emit("   UI updated for session restore.")
        settings = self.interrupted_session_data.get("ui_settings", {})
        self._load_ui_from_settings_dict(settings)
        
        self.is_restore_pending = True
        self._update_button_states_and_connections() # Update buttons for restore state, UI remains editable

    def _clear_session_and_reset_ui(self):
        """Clears the session file and resets the UI to its default state."""
        self._clear_session_file()
        self.interrupted_session_data = None
        self.is_restore_pending = False
        self._update_button_states_and_connections() # Ensure buttons are updated to idle state
        self.reset_application_state()

    def _clear_session_file(self):
        """Safely deletes the session file."""
        if os.path.exists(self.session_file_path):
            try:
                os.remove(self.session_file_path)
                self.log_signal.emit("ℹ️ Interrupted session file cleared.")
            except Exception as e:
                self.log_signal.emit(f"❌ Failed to clear session file: {e}")

    def _save_session_file(self, session_data):
        """Safely saves the session data to the session file using an atomic write pattern."""
        temp_session_file_path = self.session_file_path + ".tmp"
        try:
            with open(temp_session_file_path, 'w', encoding='utf-8') as f:
                json.dump(session_data, f, indent=2)
            os.replace(temp_session_file_path, self.session_file_path)
        except Exception as e:
            self.log_signal.emit(f"❌ Failed to save session state: {e}")
            if os.path.exists(temp_session_file_path):
                try:
                    os.remove(temp_session_file_path)
                except Exception as e_rem:
                    self.log_signal.emit(f"❌ Failed to remove temp session file: {e_rem}")

    def _update_button_states_and_connections(self):
        """
        Updates the text and click connections of the main action buttons
        based on the current application state (downloading, paused, restore pending, idle).
        """
        # Disconnect all signals first to prevent multiple connections
        try: self.download_btn.clicked.disconnect()
        except TypeError: pass
        try: self.pause_btn.clicked.disconnect()
        except TypeError: pass
        try: self.cancel_btn.clicked.disconnect()
        except TypeError: pass

        is_download_active = self._is_download_active()

        if self.is_restore_pending:
            # State: Restore Pending
            self.download_btn.setText(self._tr("start_download_button_text", "⬇️ Start Download"))
            self.download_btn.setEnabled(True)
            self.download_btn.clicked.connect(self.start_download)
            self.download_btn.setToolTip(self._tr("start_download_discard_tooltip", "Click to start a new download, discarding the previous session."))

            self.pause_btn.setText(self._tr("restore_download_button_text", "🔄 Restore Download"))
            self.pause_btn.setEnabled(True)
            self.pause_btn.clicked.connect(self.restore_download)
            self.pause_btn.setToolTip(self._tr("restore_download_button_tooltip", "Click to restore the interrupted download."))
            self.cancel_btn.setEnabled(True)

            self.cancel_btn.setText(self._tr("cancel_button_text", "❌ Cancel & Reset UI"))
            self.cancel_btn.setEnabled(False) # Nothing to cancel yet
            self.cancel_btn.setToolTip(self._tr("cancel_button_tooltip", "Click to cancel the ongoing download/extraction process and reset the UI fields (preserving URL and Directory)."))
        elif is_download_active:
            # State: Downloading / Paused
            self.download_btn.setText(self._tr("start_download_button_text", "⬇️ Start Download"))
            self.download_btn.setEnabled(False) # Cannot start new download while one is active

            self.pause_btn.setText(self._tr("resume_download_button_text", "▶️ Resume Download") if self.is_paused else self._tr("pause_download_button_text", "⏸️ Pause Download"))
            self.pause_btn.setEnabled(True)
            self.pause_btn.clicked.connect(self._handle_pause_resume_action)
            self.pause_btn.setToolTip(self._tr("resume_download_button_tooltip", "Click to resume the download.") if self.is_paused else self._tr("pause_download_button_tooltip", "Click to pause the download."))

            self.cancel_btn.setText(self._tr("cancel_button_text", "❌ Cancel & Reset UI"))
            self.cancel_btn.setEnabled(True)
            self.cancel_btn.clicked.connect(self.cancel_download_button_action)
            self.cancel_btn.setToolTip(self._tr("cancel_button_tooltip", "Click to cancel the ongoing download/extraction process and reset the UI fields (preserving URL and Directory)."))
        else:
            # State: Idle (No download, no restore pending)
            self.download_btn.setText(self._tr("start_download_button_text", "⬇️ Start Download"))
            self.download_btn.setEnabled(True)
            self.download_btn.clicked.connect(self.start_download)

            self.pause_btn.setText(self._tr("pause_download_button_text", "⏸️ Pause Download"))
            self.pause_btn.setEnabled(False) # No active download to pause
            self.pause_btn.setToolTip(self._tr("pause_download_button_tooltip", "Click to pause the ongoing download process."))

            self.cancel_btn.setText(self._tr("cancel_button_text", "❌ Cancel & Reset UI"))
            self.cancel_btn.setEnabled(False) # No active download to cancel
            self.cancel_btn.setToolTip(self._tr("cancel_button_tooltip", "Click to cancel the ongoing download/extraction process and reset the UI fields (preserving URL and Directory)."))


    def _retranslate_main_ui (self ):
        """Retranslates static text elements in the main UI."""
        if self .url_label_widget :
            self .url_label_widget .setText (self ._tr ("creator_post_url_label","🔗 Kemono Creator/Post URL:"))
        if self .download_location_label_widget :
            self .download_location_label_widget .setText (self ._tr ("download_location_label","📁 Download Location:"))
        if hasattr (self ,'character_label')and self .character_label :
            self .character_label .setText (self ._tr ("filter_by_character_label","🎯 Filter by Character(s) (comma-separated):"))
        if self .skip_words_label_widget :
            self .skip_words_label_widget .setText (self ._tr ("skip_with_words_label","🚫 Skip with Words (comma-separated):"))
        if self .remove_from_filename_label_widget :
            self .remove_from_filename_label_widget .setText (self ._tr ("remove_words_from_name_label","✂️ Remove Words from name:"))
        if hasattr (self ,'radio_all'):self .radio_all .setText (self ._tr ("filter_all_radio","All"))
        if hasattr (self ,'radio_images'):self .radio_images .setText (self ._tr ("filter_images_radio","Images/GIFs"))
        if hasattr (self ,'radio_videos'):self .radio_videos .setText (self ._tr ("filter_videos_radio","Videos"))
        if hasattr (self ,'radio_only_archives'):self .radio_only_archives .setText (self ._tr ("filter_archives_radio","📦 Only Archives"))
        if hasattr (self ,'radio_only_links'):self .radio_only_links .setText (self ._tr ("filter_links_radio","🔗 Only Links"))
        if hasattr (self ,'radio_only_audio'):self .radio_only_audio .setText (self ._tr ("filter_audio_radio","🎧 Only Audio"))
        if hasattr (self ,'favorite_mode_checkbox'):self .favorite_mode_checkbox .setText (self ._tr ("favorite_mode_checkbox_label","⭐ Favorite Mode"))
        if hasattr (self ,'dir_button'):self .dir_button .setText (self ._tr ("browse_button_text","Browse..."))
        self ._update_char_filter_scope_button_text ()
        self ._update_skip_scope_button_text ()

        if hasattr (self ,'skip_zip_checkbox'):self .skip_zip_checkbox .setText (self ._tr ("skip_zip_checkbox_label","Skip .zip"))
        if hasattr (self ,'skip_rar_checkbox'):self .skip_rar_checkbox .setText (self ._tr ("skip_rar_checkbox_label","Skip .rar"))
        if hasattr (self ,'download_thumbnails_checkbox'):self .download_thumbnails_checkbox .setText (self ._tr ("download_thumbnails_checkbox_label","Download Thumbnails Only"))
        if hasattr (self ,'scan_content_images_checkbox'):self .scan_content_images_checkbox .setText (self ._tr ("scan_content_images_checkbox_label","Scan Content for Images"))
        if hasattr (self ,'compress_images_checkbox'):self .compress_images_checkbox .setText (self ._tr ("compress_images_checkbox_label","Compress to WebP"))
        if hasattr (self ,'use_subfolders_checkbox'):self .use_subfolders_checkbox .setText (self ._tr ("separate_folders_checkbox_label","Separate Folders by Name/Title"))
        if hasattr (self ,'use_subfolder_per_post_checkbox'):self .use_subfolder_per_post_checkbox .setText (self ._tr ("subfolder_per_post_checkbox_label","Subfolder per Post"))
        if hasattr (self ,'use_cookie_checkbox'):self .use_cookie_checkbox .setText (self ._tr ("use_cookie_checkbox_label","Use Cookie"))
        if hasattr (self ,'use_multithreading_checkbox'):self .update_multithreading_label (self .thread_count_input .text ()if hasattr (self ,'thread_count_input')else "1")
        if hasattr (self ,'external_links_checkbox'):self .external_links_checkbox .setText (self ._tr ("show_external_links_checkbox_label","Show External Links in Log"))
        if hasattr (self ,'manga_mode_checkbox'):self .manga_mode_checkbox .setText (self ._tr ("manga_comic_mode_checkbox_label","Manga/Comic Mode"))
        if hasattr (self ,'thread_count_label'):self .thread_count_label .setText (self ._tr ("threads_label","Threads:"))

        if hasattr (self ,'character_input'):
            self .character_input .setToolTip (self ._tr ("character_input_tooltip","Enter character names (comma-separated)..."))
        if hasattr (self ,'download_btn'):self .download_btn .setToolTip (self ._tr ("start_download_button_tooltip","Click to start the download or link extraction process with the current settings."))





        current_download_is_active =self ._is_download_active ()if hasattr (self ,'_is_download_active')else False 
        self .set_ui_enabled (not current_download_is_active )

        if hasattr (self ,'known_chars_label'):self .known_chars_label .setText (self ._tr ("known_chars_label_text","🎭 Known Shows/Characters (for Folder Names):"))
        if hasattr (self ,'open_known_txt_button'):self .open_known_txt_button .setText (self ._tr ("open_known_txt_button_text","Open Known.txt"));self .open_known_txt_button .setToolTip (self ._tr ("open_known_txt_button_tooltip","Open the 'Known.txt' file..."))
        if hasattr (self ,'add_char_button'):self .add_char_button .setText (self ._tr ("add_char_button_text","➕ Add"));self .add_char_button .setToolTip (self ._tr ("add_char_button_tooltip","Add the name from the input field..."))
        if hasattr (self ,'add_to_filter_button'):self .add_to_filter_button .setText (self ._tr ("add_to_filter_button_text","⤵️ Add to Filter"));self .add_to_filter_button .setToolTip (self ._tr ("add_to_filter_button_tooltip","Select names from 'Known Shows/Characters' list..."))
        if hasattr (self ,'character_list'):
            self .character_list .setToolTip (self ._tr ("known_chars_list_tooltip","This list contains names used for automatic folder creation..."))
        if hasattr (self ,'delete_char_button'):self .delete_char_button .setText (self ._tr ("delete_char_button_text","🗑️ Delete Selected"));self .delete_char_button .setToolTip (self ._tr ("delete_char_button_tooltip","Delete the selected name(s)..."))

        if hasattr (self ,'cancel_btn'):self .cancel_btn .setToolTip (self ._tr ("cancel_button_tooltip","Click to cancel the ongoing download/extraction process and reset the UI fields (preserving URL and Directory)."))
        if hasattr (self ,'error_btn'):self .error_btn .setText (self ._tr ("error_button_text","Error"));self .error_btn .setToolTip (self ._tr ("error_button_tooltip","View files skipped due to errors and optionally retry them."))
        if hasattr (self ,'progress_log_label'):self .progress_log_label .setText (self ._tr ("progress_log_label_text","📜 Progress Log:"))
        if hasattr (self ,'reset_button'):self .reset_button .setText (self ._tr ("reset_button_text","🔄 Reset"));self .reset_button .setToolTip (self ._tr ("reset_button_tooltip","Reset all inputs and logs to default state (only when idle)."))
        self ._update_multipart_toggle_button_text ()
        if hasattr (self ,'progress_label')and not self ._is_download_active ():self .progress_label .setText (self ._tr ("progress_idle_text","Progress: Idle"))
        if hasattr (self ,'favorite_mode_artists_button'):self .favorite_mode_artists_button .setText (self ._tr ("favorite_artists_button_text","🖼️ Favorite Artists"));self .favorite_mode_artists_button .setToolTip (self ._tr ("favorite_artists_button_tooltip","Browse and download from your favorite artists..."))
        if hasattr (self ,'favorite_mode_posts_button'):self .favorite_mode_posts_button .setText (self ._tr ("favorite_posts_button_text","📄 Favorite Posts"));self .favorite_mode_posts_button .setToolTip (self ._tr ("favorite_posts_button_tooltip","Browse and download your favorite posts..."))
        self ._update_favorite_scope_button_text ()
        if hasattr (self ,'page_range_label'):self .page_range_label .setText (self ._tr ("page_range_label_text","Page Range:"))
        if hasattr (self ,'start_page_input'):
            self .start_page_input .setPlaceholderText (self ._tr ("start_page_input_placeholder","Start"))
            self .start_page_input .setToolTip (self ._tr ("start_page_input_tooltip","For creator URLs: Specify the starting page number..."))
        if hasattr (self ,'to_label'):self .to_label .setText (self ._tr ("page_range_to_label_text","to"))
        if hasattr (self ,'end_page_input'):
            self .end_page_input .setPlaceholderText (self ._tr ("end_page_input_placeholder","End"))
            self .end_page_input .setToolTip (self ._tr ("end_page_input_tooltip","For creator URLs: Specify the ending page number..."))
        if hasattr (self ,'fav_mode_active_label'):
            self .fav_mode_active_label .setText (self ._tr ("fav_mode_active_label_text","⭐ Favorite Mode is active..."))
        if hasattr (self ,'cookie_browse_button'):
            self .cookie_browse_button .setToolTip (self ._tr ("cookie_browse_button_tooltip","Browse for a cookie file..."))
        self ._update_manga_filename_style_button_text ()
        if hasattr (self ,'export_links_button'):self .export_links_button .setText (self ._tr ("export_links_button_text","Export Links"))
        if hasattr (self ,'download_extracted_links_button'):self .download_extracted_links_button .setText (self ._tr ("download_extracted_links_button_text","Download"))
        self ._update_log_display_mode_button_text ()


        if hasattr (self ,'radio_all'):self .radio_all .setToolTip (self ._tr ("radio_all_tooltip","Download all file types found in posts."))
        if hasattr (self ,'radio_images'):self .radio_images .setToolTip (self ._tr ("radio_images_tooltip","Download only common image formats (JPG, PNG, GIF, WEBP, etc.)."))
        if hasattr (self ,'radio_videos'):self .radio_videos .setToolTip (self ._tr ("radio_videos_tooltip","Download only common video formats (MP4, MKV, WEBM, MOV, etc.)."))
        if hasattr (self ,'radio_only_archives'):self .radio_only_archives .setToolTip (self ._tr ("radio_only_archives_tooltip","Exclusively download .zip and .rar files. Other file-specific options are disabled."))
        if hasattr (self ,'radio_only_audio'):self .radio_only_audio .setToolTip (self ._tr ("radio_only_audio_tooltip","Download only common audio formats (MP3, WAV, FLAC, etc.)."))
        if hasattr (self ,'radio_only_links'):self .radio_only_links .setToolTip (self ._tr ("radio_only_links_tooltip","Extract and display external links from post descriptions instead of downloading files.\nDownload-related options will be disabled."))


        if hasattr (self ,'use_subfolders_checkbox'):self .use_subfolders_checkbox .setToolTip (self ._tr ("use_subfolders_checkbox_tooltip","Create subfolders based on 'Filter by Character(s)' input..."))
        if hasattr (self ,'use_subfolder_per_post_checkbox'):self .use_subfolder_per_post_checkbox .setToolTip (self ._tr ("use_subfolder_per_post_checkbox_tooltip","Creates a subfolder for each post..."))
        if hasattr (self ,'use_cookie_checkbox'):self .use_cookie_checkbox .setToolTip (self ._tr ("use_cookie_checkbox_tooltip","If checked, will attempt to use cookies..."))
        if hasattr (self ,'use_multithreading_checkbox'):self .use_multithreading_checkbox .setToolTip (self ._tr ("use_multithreading_checkbox_tooltip","Enables concurrent operations..."))
        if hasattr (self ,'thread_count_input'):self .thread_count_input .setToolTip (self ._tr ("thread_count_input_tooltip","Number of concurrent operations..."))
        if hasattr (self ,'external_links_checkbox'):self .external_links_checkbox .setToolTip (self ._tr ("external_links_checkbox_tooltip","If checked, a secondary log panel appears..."))
        if hasattr (self ,'manga_mode_checkbox'):self .manga_mode_checkbox .setToolTip (self ._tr ("manga_mode_checkbox_tooltip","Downloads posts from oldest to newest..."))

        if hasattr (self ,'scan_content_images_checkbox'):self .scan_content_images_checkbox .setToolTip (self ._tr ("scan_content_images_checkbox_tooltip",self ._original_scan_content_tooltip ))
        if hasattr (self ,'download_thumbnails_checkbox'):self .download_thumbnails_checkbox .setToolTip (self ._tr ("download_thumbnails_checkbox_tooltip","Downloads small preview images..."))
        if hasattr (self ,'skip_words_input'):
            self .skip_words_input .setToolTip (self ._tr ("skip_words_input_tooltip",
            ("Enter words, comma-separated, to skip downloading certain content (e.g., WIP, sketch, preview).\n\n"
            "The 'Scope: [Type]' button next to this input cycles how this filter applies:\n"
            "- Scope: Files: Skips individual files if their names contain any of these words.\n"
            "- Scope: Posts: Skips entire posts if their titles contain any of these words.\n"
            "- Scope: Both: Applies both (post title first, then individual files if post title is okay).")))
        if hasattr (self ,'remove_from_filename_input'):
            self .remove_from_filename_input .setToolTip (self ._tr ("remove_words_input_tooltip",
            ("Enter words, comma-separated, to remove from downloaded filenames (case-insensitive).\n"
            "Useful for cleaning up common prefixes/suffixes.\nExample: patreon, kemono, [HD], _final")))

        if hasattr (self ,'link_input'):
            self .link_input .setPlaceholderText (self ._tr ("link_input_placeholder_text","e.g., https://kemono.su/patreon/user/12345 or .../post/98765"))
            self .link_input .setToolTip (self ._tr ("link_input_tooltip_text","Enter the full URL..."))
        if hasattr (self ,'dir_input'):
            self .dir_input .setPlaceholderText (self ._tr ("dir_input_placeholder_text","Select folder where downloads will be saved"))
            self .dir_input .setToolTip (self ._tr ("dir_input_tooltip_text","Enter or browse to the main folder..."))
        if hasattr (self ,'character_input'):
            self .character_input .setPlaceholderText (self ._tr ("character_input_placeholder_text","e.g., Tifa, Aerith, (Cloud, Zack)"))
        if hasattr (self ,'custom_folder_input'):
            self .custom_folder_input .setPlaceholderText (self ._tr ("custom_folder_input_placeholder_text","Optional: Save this post to specific folder"))
            self .custom_folder_input .setToolTip (self ._tr ("custom_folder_input_tooltip_text","If downloading a single post URL..."))
        if hasattr (self ,'skip_words_input'):
            self .skip_words_input .setPlaceholderText (self ._tr ("skip_words_input_placeholder_text","e.g., WM, WIP, sketch, preview"))
        if hasattr (self ,'remove_from_filename_input'):
            self .remove_from_filename_input .setPlaceholderText (self ._tr ("remove_from_filename_input_placeholder_text","e.g., patreon, HD"))
        self ._update_cookie_input_placeholders_and_tooltips ()
        if hasattr (self ,'character_search_input'):
            self .character_search_input .setPlaceholderText (self ._tr ("character_search_input_placeholder_text","Search characters..."))
            self .character_search_input .setToolTip (self ._tr ("character_search_input_tooltip_text","Type here to filter the list..."))
        if hasattr (self ,'new_char_input'):
            self .new_char_input .setPlaceholderText (self ._tr ("new_char_input_placeholder_text","Add new show/character name"))
            self .new_char_input .setToolTip (self ._tr ("new_char_input_tooltip_text","Enter a new show, game, or character name..."))
        if hasattr (self ,'link_search_input'):
            self .link_search_input .setPlaceholderText (self ._tr ("link_search_input_placeholder_text","Search Links..."))
            self .link_search_input .setToolTip (self ._tr ("link_search_input_tooltip_text","When in 'Only Links' mode..."))
        if hasattr (self ,'manga_date_prefix_input'):
            self .manga_date_prefix_input .setPlaceholderText (self ._tr ("manga_date_prefix_input_placeholder_text","Prefix for Manga Filenames"))
            self .manga_date_prefix_input .setToolTip (self ._tr ("manga_date_prefix_input_tooltip_text","Optional prefix for 'Date Based'..."))
        if hasattr (self ,'empty_popup_button'):self .empty_popup_button .setToolTip (self ._tr ("empty_popup_button_tooltip_text","Open Creator Selection..."))
        if hasattr (self ,'known_names_help_button'):self .known_names_help_button .setToolTip (self ._tr ("known_names_help_button_tooltip_text","Open the application feature guide."))
        if hasattr (self ,'future_settings_button'):self .future_settings_button .setToolTip (self ._tr ("future_settings_button_tooltip_text","Open application settings..."))
        if hasattr (self ,'link_search_button'):self .link_search_button .setToolTip (self ._tr ("link_search_button_tooltip_text","Filter displayed links"))
    def apply_theme (self ,theme_name ,initial_load =False ):
        self .current_theme =theme_name 
        if not initial_load :
            self .settings .setValue (THEME_KEY ,theme_name )
            self .settings .sync ()

        if theme_name =="dark":
            self .setStyleSheet (self .get_dark_theme ())
            if not initial_load :
                self .log_signal .emit ("🎨 Switched to Dark Mode.")
        else :
            self .setStyleSheet ("")
            if not initial_load :
                self .log_signal .emit ("🎨 Switched to Light Mode.")
        self .update ()

    def _get_tooltip_for_character_input (self ):
        return (
        self ._tr ("character_input_tooltip","Default tooltip if translation fails.")
        )
    def _connect_signals (self ):
        self .actual_gui_signals .progress_signal .connect (self .handle_main_log )
        self .actual_gui_signals .file_progress_signal .connect (self .update_file_progress_display )
        self .actual_gui_signals .missed_character_post_signal .connect (self .handle_missed_character_post )
        self .actual_gui_signals .external_link_signal .connect (self .handle_external_link_signal )
        self .actual_gui_signals .file_successfully_downloaded_signal .connect (self ._handle_actual_file_downloaded )
        self .actual_gui_signals .file_download_status_signal .connect (lambda status :None )

        if hasattr (self ,'character_input'):
            self .character_input .textChanged .connect (self ._on_character_input_changed_live )
        if hasattr (self ,'use_cookie_checkbox'):
            self .use_cookie_checkbox .toggled .connect (self ._update_cookie_input_visibility )
        if hasattr (self ,'link_input'):
            self .link_input .textChanged .connect (self ._sync_queue_with_link_input )
        if hasattr (self ,'cookie_browse_button'):
            self .cookie_browse_button .clicked .connect (self ._browse_cookie_file )
        if hasattr (self ,'cookie_text_input'):
            self .cookie_text_input .textChanged .connect (self ._handle_cookie_text_manual_change )
        if hasattr (self ,'download_thumbnails_checkbox'):
            self .download_thumbnails_checkbox .toggled .connect (self ._handle_thumbnail_mode_change )
        self .gui_update_timer .timeout .connect (self ._process_worker_queue )
        self .gui_update_timer .start (100 )
        self .log_signal .connect (self .handle_main_log )
        self .add_character_prompt_signal .connect (self .prompt_add_character )
        self .character_prompt_response_signal .connect (self .receive_add_character_result )
        self .overall_progress_signal .connect (self .update_progress_display )
        self .post_processed_for_history_signal .connect (self ._add_to_history_candidates )
        self .finished_signal .connect (self .download_finished )
        if hasattr (self ,'character_search_input'):self .character_search_input .textChanged .connect (self .filter_character_list )
        if hasattr (self ,'external_links_checkbox'):self .external_links_checkbox .toggled .connect (self .update_external_links_setting )
        if hasattr (self ,'thread_count_input'):self .thread_count_input .textChanged .connect (self .update_multithreading_label )
        if hasattr (self ,'use_subfolder_per_post_checkbox'):self .use_subfolder_per_post_checkbox .toggled .connect (self .update_ui_for_subfolders )
        if hasattr (self ,'use_multithreading_checkbox'):self .use_multithreading_checkbox .toggled .connect (self ._handle_multithreading_toggle )

        if hasattr (self ,'radio_group')and self .radio_group :
            self .radio_group .buttonToggled .connect (self ._handle_filter_mode_change )

        if self .reset_button :self .reset_button .clicked .connect (self .reset_application_state )
        if self .log_verbosity_toggle_button :self .log_verbosity_toggle_button .clicked .connect (self .toggle_active_log_view )

        if self .link_search_button :self .link_search_button .clicked .connect (self ._filter_links_log )
        if self .link_search_input :
            self .link_search_input .returnPressed .connect (self ._filter_links_log )
            self .link_search_input .textChanged .connect (self ._filter_links_log )
        if self .export_links_button :self .export_links_button .clicked .connect (self ._export_links_to_file )

        if self .manga_mode_checkbox :self .manga_mode_checkbox .toggled .connect (self .update_ui_for_manga_mode )


        if hasattr (self ,'download_extracted_links_button'):
            self .download_extracted_links_button .clicked .connect (self ._show_download_extracted_links_dialog )

        if hasattr (self ,'log_display_mode_toggle_button'):
            self .log_display_mode_toggle_button .clicked .connect (self ._toggle_log_display_mode )

        if self .manga_rename_toggle_button :self .manga_rename_toggle_button .clicked .connect (self ._toggle_manga_filename_style )

        if hasattr (self ,'link_input'):
            self .link_input .textChanged .connect (lambda :self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False ))

        if self .skip_scope_toggle_button :
            self .skip_scope_toggle_button .clicked .connect (self ._cycle_skip_scope )

        if self .char_filter_scope_toggle_button :
            self .char_filter_scope_toggle_button .clicked .connect (self ._cycle_char_filter_scope )

        if hasattr (self ,'multipart_toggle_button'):self .multipart_toggle_button .clicked .connect (self ._toggle_multipart_mode )


        if hasattr (self ,'favorite_mode_checkbox'):
            self .favorite_mode_checkbox .toggled .connect (self ._handle_favorite_mode_toggle )

        if hasattr (self ,'open_known_txt_button'):
            self .open_known_txt_button .clicked .connect (self ._open_known_txt_file )

        if hasattr (self ,'add_to_filter_button'):
            self .add_to_filter_button .clicked .connect (self ._show_add_to_filter_dialog )
        if hasattr (self ,'favorite_mode_artists_button'):
            self .favorite_mode_artists_button .clicked .connect (self ._show_favorite_artists_dialog )
        if hasattr (self ,'favorite_mode_posts_button'):
            self .favorite_mode_posts_button .clicked .connect (self ._show_favorite_posts_dialog )
        if hasattr (self ,'favorite_scope_toggle_button'):
            self .favorite_scope_toggle_button .clicked .connect (self ._cycle_favorite_scope )
        if hasattr (self ,'history_button'):
            self .history_button .clicked .connect (self ._show_download_history_dialog )
        if hasattr (self ,'error_btn'):
            self .error_btn .clicked .connect (self ._show_error_files_dialog )

    def _on_character_input_changed_live (self ,text ):
        """
        Called when the character input field text changes.
        If a download is active (running or paused), this updates the dynamic filter holder.
        """
        if self ._is_download_active ():
            QCoreApplication .processEvents ()
            raw_character_filters_text =self .character_input .text ().strip ()
            parsed_filters =self ._parse_character_filters (raw_character_filters_text )

            self .dynamic_character_filter_holder .set_filters (parsed_filters )

    def _parse_character_filters (self ,raw_text ):
        """Helper to parse character filter string into list of objects."""
        parsed_character_filter_objects =[]
        if raw_text :
            raw_parts =[]
            current_part_buffer =""
            in_group_parsing =False 
            for char_token in raw_text :
                if char_token =='('and not in_group_parsing :
                    in_group_parsing =True 
                    current_part_buffer +=char_token 
                elif char_token ==')'and in_group_parsing :
                    in_group_parsing =False 
                    current_part_buffer +=char_token 
                elif char_token ==','and not in_group_parsing :
                    if current_part_buffer .strip ():raw_parts .append (current_part_buffer .strip ())
                    current_part_buffer =""
                else :
                    current_part_buffer +=char_token 
            if current_part_buffer .strip ():raw_parts .append (current_part_buffer .strip ())

            for part_str in raw_parts :
                part_str =part_str .strip ()
                if not part_str :continue 

                is_tilde_group =part_str .startswith ("(")and part_str .endswith (")~")
                is_standard_group_for_splitting =part_str .startswith ("(")and part_str .endswith (")")and not is_tilde_group 

                if is_tilde_group :
                    group_content_str =part_str [1 :-2 ].strip ()
                    aliases_in_group =[alias .strip ()for alias in group_content_str .split (',')if alias .strip ()]
                    if aliases_in_group :
                        group_folder_name =" ".join (aliases_in_group )
                        parsed_character_filter_objects .append ({"name":group_folder_name ,"is_group":True ,"aliases":aliases_in_group })
                elif is_standard_group_for_splitting :
                    group_content_str =part_str [1 :-1 ].strip ()
                    aliases_in_group =[alias .strip ()for alias in group_content_str .split (',')if alias .strip ()]
                    if aliases_in_group :
                        group_folder_name =" ".join (aliases_in_group )
                        parsed_character_filter_objects .append ({
                        "name":group_folder_name ,
                        "is_group":True ,
                        "aliases":aliases_in_group ,
                        "components_are_distinct_for_known_txt":True 
                        })
                else :
                    parsed_character_filter_objects .append ({"name":part_str ,"is_group":False ,"aliases":[part_str ],"components_are_distinct_for_known_txt":False })
        return parsed_character_filter_objects 

    def _process_worker_queue (self ):
        """Processes messages from the worker queue and emits Qt signals from the GUI thread."""
        while not self .worker_to_gui_queue .empty ():
            try :
                item =self .worker_to_gui_queue .get_nowait ()
                signal_type =item .get ('type')
                payload =item .get ('payload',tuple ())

                if signal_type =='progress':
                    self .actual_gui_signals .progress_signal .emit (*payload )
                elif signal_type =='file_download_status':
                    self .actual_gui_signals .file_download_status_signal .emit (*payload )
                elif signal_type =='external_link':
                    self .actual_gui_signals .external_link_signal .emit (*payload )
                elif signal_type =='file_progress':
                    self .actual_gui_signals .file_progress_signal .emit (*payload )
                elif signal_type =='missed_character_post':
                    self .actual_gui_signals .missed_character_post_signal .emit (*payload )
                elif signal_type =='file_successfully_downloaded':
                    self ._handle_actual_file_downloaded (payload [0 ]if payload else {})
                elif signal_type =='file_successfully_downloaded':
                    self ._handle_file_successfully_downloaded (payload [0 ])
                else :
                    self .log_signal .emit (f"⚠️ Unknown signal type from worker queue: {signal_type }")
                self .worker_to_gui_queue .task_done ()
            except queue .Empty :
                break 
            except Exception as e :
                self .log_signal .emit (f"❌ Error processing worker queue: {e }")

    def load_known_names_from_util (self ):
        global KNOWN_NAMES 
        if os .path .exists (self .config_file ):
            parsed_known_objects =[]
            try :
                with open (self .config_file ,'r',encoding ='utf-8')as f :
                    for line_num ,line in enumerate (f ,1 ):
                        line =line .strip ()
                        if not line :continue 

                        if line .startswith ("(")and line .endswith (")"):
                            content =line [1 :-1 ].strip ()
                            parts =[p .strip ()for p in content .split (',')if p .strip ()]
                            if parts :
                                folder_name_raw =content .replace (',',' ')
                                folder_name_cleaned =clean_folder_name (folder_name_raw )

                                unique_aliases_set ={p for p in parts }
                                final_aliases_list =sorted (list (unique_aliases_set ),key =str .lower )

                                if not folder_name_cleaned :
                                    if hasattr (self ,'log_signal'):self .log_signal .emit (f"⚠️ Group resulted in empty folder name after cleaning in Known.txt on line {line_num }: '{line }'. Skipping entry.")
                                    continue 

                                parsed_known_objects .append ({
                                "name":folder_name_cleaned ,
                                "is_group":True ,
                                "aliases":final_aliases_list 
                                })
                            else :
                                if hasattr (self ,'log_signal'):self .log_signal .emit (f"⚠️ Empty group found in Known.txt on line {line_num }: '{line }'")
                        else :
                            parsed_known_objects .append ({
                            "name":line ,
                            "is_group":False ,
                            "aliases":[line ]
                            })
                parsed_known_objects .sort (key =lambda x :x ["name"].lower ())
                KNOWN_NAMES [:]=parsed_known_objects 
                log_msg =f"ℹ️ Loaded {len (KNOWN_NAMES )} known entries from {self .config_file }"
            except Exception as e :
                log_msg =f"❌ Error loading config '{self .config_file }': {e }"
                QMessageBox .warning (self ,"Config Load Error",f"Could not load list from {self .config_file }:\n{e }")
                KNOWN_NAMES [:]=[]
        else :
            self .character_input .setToolTip ("Names, comma-separated. Group aliases: (alias1, alias2, alias3) becomes folder name 'alias1 alias2 alias3' (after cleaning).\nAll names in the group are used as aliases for matching.\nE.g., yor, (Boa, Hancock, Snake Princess)")
            log_msg =f"ℹ️ Config file '{self .config_file }' not found. It will be created on save."
            KNOWN_NAMES [:]=[]

        if hasattr (self ,'log_signal'):self .log_signal .emit (log_msg )

        if hasattr (self ,'character_list'):
            self .character_list .clear ()
            if not KNOWN_NAMES :
                self .log_signal .emit ("ℹ️ 'Known.txt' is empty or was not found. No default entries will be added.")

            self .character_list .addItems ([entry ["name"]for entry in KNOWN_NAMES ])

    def save_known_names (self ):
        global KNOWN_NAMES 
        try :
            with open (self .config_file ,'w',encoding ='utf-8')as f :
                for entry in KNOWN_NAMES :
                    if entry ["is_group"]:
                        f .write (f"({', '.join (sorted (entry ['aliases'],key =str .lower ))})\n")
                    else :
                        f .write (entry ["name"]+'\n')
            if hasattr (self ,'log_signal'):self .log_signal .emit (f"💾 Saved {len (KNOWN_NAMES )} known entries to {self .config_file }")
        except Exception as e :
            log_msg =f"❌ Error saving config '{self .config_file }': {e }"
            if hasattr (self ,'log_signal'):self .log_signal .emit (log_msg )
            QMessageBox .warning (self ,"Config Save Error",f"Could not save list to {self .config_file }:\n{e }")

    def closeEvent (self ,event ):
        self .save_known_names ()
        self .settings .setValue (MANGA_FILENAME_STYLE_KEY ,self .manga_filename_style )
        self .settings .setValue (ALLOW_MULTIPART_DOWNLOAD_KEY ,self .allow_multipart_download_setting )
        self .settings .setValue (COOKIE_TEXT_KEY ,self .cookie_text_input .text ()if hasattr (self ,'cookie_text_input')else "")
        self .settings .setValue (SCAN_CONTENT_IMAGES_KEY ,self .scan_content_images_checkbox .isChecked ()if hasattr (self ,'scan_content_images_checkbox')else False )
        self .settings .setValue (USE_COOKIE_KEY ,self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False )
        self .settings .setValue (THEME_KEY ,self .current_theme )
        self .settings .setValue (LANGUAGE_KEY ,self .current_selected_language )
        self .settings .sync ()
        self ._save_persistent_history ()

        should_exit =True 
        is_downloading =self ._is_download_active ()

        if is_downloading :
            reply =QMessageBox .question (self ,"Confirm Exit",
            "Download in progress. Are you sure you want to exit and cancel?",
            QMessageBox .Yes |QMessageBox .No ,QMessageBox .No )
            if reply ==QMessageBox .Yes :
                self .log_signal .emit ("⚠️ Cancelling active download due to application exit...")
                self .cancellation_event .set ()
                if self .download_thread and self .download_thread .isRunning ():
                    self .download_thread .requestInterruption ()
                    self .log_signal .emit ("   Signaled single download thread to interrupt.")
                if self .download_thread and self .download_thread .isRunning ():
                    self .log_signal .emit ("   Waiting for single download thread to finish...")
                    self .download_thread .wait (3000 )
                    if self .download_thread .isRunning ():
                        self .log_signal .emit ("   ⚠️ Single download thread did not terminate gracefully.")

                if self .thread_pool :
                    self .log_signal .emit ("   Shutting down thread pool (waiting for completion)...")
                    self .thread_pool .shutdown (wait =True ,cancel_futures =True )
                    self .log_signal .emit ("   Thread pool shutdown complete.")
                    self .thread_pool =None 
                self .log_signal .emit ("   Cancellation for exit complete.")
            else :
                should_exit =False 
                self .log_signal .emit ("ℹ️ Application exit cancelled.")
                event .ignore ()
                return 

        if should_exit :
            self .log_signal .emit ("ℹ️ Application closing.")
            if self .thread_pool :
                self .log_signal .emit ("   Final thread pool check: Shutting down...")
                self .cancellation_event .set ()
                self .thread_pool .shutdown (wait =True ,cancel_futures =True )
                self .thread_pool =None 
            self .log_signal .emit ("👋 Exiting application.")
            event .accept ()


    def _request_restart_application (self ):
        self .log_signal .emit ("🔄 Application restart requested by user for language change.")
        self ._restart_pending =True 
        self .close ()

    def _do_actual_restart (self ):
        try :
            self .log_signal .emit ("   Performing application restart...")
            python_executable =sys .executable 
            script_args =sys .argv 


            if getattr (sys ,'frozen',False ):



                QProcess .startDetached (python_executable ,script_args [1 :])
            else :


                QProcess .startDetached (python_executable ,script_args )

            QCoreApplication .instance ().quit ()
        except Exception as e :
            self .log_signal .emit (f"❌ CRITICAL: Failed to start new application instance: {e }")
            QMessageBox .critical (self ,"Restart Failed",
            f"Could not automatically restart the application: {e }\n\nPlease restart it manually.")


    def init_ui (self ):
        self .main_splitter =QSplitter (Qt .Horizontal )
        left_panel_widget =QWidget ()
        right_panel_widget =QWidget ()
        left_layout =QVBoxLayout (left_panel_widget )
        right_layout =QVBoxLayout (right_panel_widget )
        left_layout .setContentsMargins (10 ,10 ,10 ,10 )
        right_layout .setContentsMargins (10 ,10 ,10 ,10 )
        self .apply_theme (self .current_theme ,initial_load =True )

        self .url_input_widget =QWidget ()
        url_input_layout =QHBoxLayout (self .url_input_widget )
        url_input_layout .setContentsMargins (0 ,0 ,0 ,0 )

        self .url_label_widget =QLabel ()
        url_input_layout .addWidget (self .url_label_widget )
        self .link_input =QLineEdit ()
        self .link_input .setPlaceholderText ("e.g., https://kemono.su/patreon/user/12345 or .../post/98765")
        self .link_input .textChanged .connect (self .update_custom_folder_visibility )
        url_input_layout .addWidget (self .link_input ,1 )
        self .empty_popup_button =QPushButton ("🎨")
        self .empty_popup_button .setStyleSheet ("padding: 4px 6px;")
        self .empty_popup_button .clicked .connect (self ._show_empty_popup )
        url_input_layout .addWidget (self .empty_popup_button )

        self .page_range_label =QLabel (self ._tr ("page_range_label_text","Page Range:"))
        self .page_range_label .setStyleSheet ("font-weight: bold; padding-left: 10px;")
        url_input_layout .addWidget (self .page_range_label )
        self .start_page_input =QLineEdit ()
        self .start_page_input .setPlaceholderText (self ._tr ("start_page_input_placeholder","Start"))
        self .start_page_input .setFixedWidth (50 )
        self .start_page_input .setValidator (QIntValidator (1 ,99999 ))
        url_input_layout .addWidget (self .start_page_input )
        self .to_label =QLabel (self ._tr ("page_range_to_label_text","to"))
        url_input_layout .addWidget (self .to_label )
        self .end_page_input =QLineEdit ()
        self .end_page_input .setPlaceholderText (self ._tr ("end_page_input_placeholder","End"))
        self .end_page_input .setFixedWidth (50 )
        self .end_page_input .setToolTip (self ._tr ("end_page_input_tooltip","For creator URLs: Specify the ending page number..."))
        self .end_page_input .setValidator (QIntValidator (1 ,99999 ))
        url_input_layout .addWidget (self .end_page_input )

        self .url_placeholder_widget =QWidget ()
        placeholder_layout =QHBoxLayout (self .url_placeholder_widget )
        placeholder_layout .setContentsMargins (0 ,0 ,0 ,0 )
        self .fav_mode_active_label =QLabel (self ._tr ("fav_mode_active_label_text","⭐ Favorite Mode is active..."))
        self .fav_mode_active_label .setAlignment (Qt .AlignCenter )
        placeholder_layout .addWidget (self .fav_mode_active_label )

        self .url_or_placeholder_stack =QStackedWidget ()
        self .url_or_placeholder_stack .addWidget (self .url_input_widget )
        self .url_or_placeholder_stack .addWidget (self .url_placeholder_widget )
        left_layout .addWidget (self .url_or_placeholder_stack )

        self .favorite_action_buttons_widget =QWidget ()
        favorite_buttons_layout =QHBoxLayout (self .favorite_action_buttons_widget )
        favorite_buttons_layout .setContentsMargins (0 ,0 ,0 ,0 )
        self .favorite_mode_artists_button =QPushButton ("🖼️ Favorite Artists")
        self .favorite_mode_artists_button .setToolTip ("Browse and download from your favorite artists on Kemono.su.")
        self .favorite_mode_artists_button .setStyleSheet ("padding: 4px 12px;")
        self .favorite_mode_artists_button .setSizePolicy (QSizePolicy .Expanding ,QSizePolicy .Preferred )
        self .favorite_mode_posts_button =QPushButton ("📄 Favorite Posts")
        self .favorite_mode_posts_button .setToolTip ("Browse and download your favorite posts from Kemono.su.")
        self .favorite_mode_posts_button .setStyleSheet ("padding: 4px 12px;")
        self .favorite_mode_posts_button .setSizePolicy (QSizePolicy .Expanding ,QSizePolicy .Preferred )

        self .favorite_scope_toggle_button =QPushButton ()
        self .favorite_scope_toggle_button .setStyleSheet ("padding: 4px 10px;")
        self .favorite_scope_toggle_button .setSizePolicy (QSizePolicy .Expanding ,QSizePolicy .Preferred )

        favorite_buttons_layout .addWidget (self .favorite_mode_artists_button )
        favorite_buttons_layout .addWidget (self .favorite_mode_posts_button )
        favorite_buttons_layout .addWidget (self .favorite_scope_toggle_button )


        self .download_location_label_widget =QLabel ()
        left_layout .addWidget (self .download_location_label_widget )
        self .dir_input =QLineEdit ()
        self .dir_input .setPlaceholderText ("Select folder where downloads will be saved")
        self .dir_button =QPushButton ("Browse...")
        self .dir_button .setStyleSheet ("padding: 4px 10px;")
        self .dir_button .clicked .connect (self .browse_directory )
        dir_layout =QHBoxLayout ()
        dir_layout .addWidget (self .dir_input ,1 )
        dir_layout .addWidget (self .dir_button )
        left_layout .addLayout (dir_layout )


        self .filters_and_custom_folder_container_widget =QWidget ()
        filters_and_custom_folder_layout =QHBoxLayout (self .filters_and_custom_folder_container_widget )
        filters_and_custom_folder_layout .setContentsMargins (0 ,5 ,0 ,0 )
        filters_and_custom_folder_layout .setSpacing (10 )

        self .character_filter_widget =QWidget ()
        character_filter_v_layout =QVBoxLayout (self .character_filter_widget )
        character_filter_v_layout .setContentsMargins (0 ,0 ,0 ,0 )
        character_filter_v_layout .setSpacing (2 )

        self .character_label =QLabel ("🎯 Filter by Character(s) (comma-separated):")
        character_filter_v_layout .addWidget (self .character_label )

        char_input_and_button_layout =QHBoxLayout ()
        char_input_and_button_layout .setContentsMargins (0 ,0 ,0 ,0 )
        char_input_and_button_layout .setSpacing (10 )

        self .character_input =QLineEdit ()
        self .character_input .setPlaceholderText ("e.g., Tifa, Aerith, (Cloud, Zack)")
        char_input_and_button_layout .addWidget (self .character_input ,3 )


        self .char_filter_scope_toggle_button =QPushButton ()
        self ._update_char_filter_scope_button_text ()
        self .char_filter_scope_toggle_button .setStyleSheet ("padding: 4px 10px;")
        self .char_filter_scope_toggle_button .setMinimumWidth (100 )
        char_input_and_button_layout .addWidget (self .char_filter_scope_toggle_button ,1 )

        character_filter_v_layout .addLayout (char_input_and_button_layout )


        self .custom_folder_widget =QWidget ()
        custom_folder_v_layout =QVBoxLayout (self .custom_folder_widget )
        custom_folder_v_layout .setContentsMargins (0 ,0 ,0 ,0 )
        custom_folder_v_layout .setSpacing (2 )
        self .custom_folder_label =QLabel ("🗄️ Custom Folder Name (Single Post Only):")
        self .custom_folder_input =QLineEdit ()
        self .custom_folder_input .setPlaceholderText ("Optional: Save this post to specific folder")
        custom_folder_v_layout .addWidget (self .custom_folder_label )
        custom_folder_v_layout .addWidget (self .custom_folder_input )
        self .custom_folder_widget .setVisible (False )

        filters_and_custom_folder_layout .addWidget (self .character_filter_widget ,1 )
        filters_and_custom_folder_layout .addWidget (self .custom_folder_widget ,1 )

        left_layout .addWidget (self .filters_and_custom_folder_container_widget )
        word_manipulation_container_widget =QWidget ()
        word_manipulation_outer_layout =QHBoxLayout (word_manipulation_container_widget )
        word_manipulation_outer_layout .setContentsMargins (0 ,0 ,0 ,0 )
        word_manipulation_outer_layout .setSpacing (15 )
        skip_words_widget =QWidget ()
        skip_words_vertical_layout =QVBoxLayout (skip_words_widget )
        skip_words_vertical_layout .setContentsMargins (0 ,0 ,0 ,0 )
        skip_words_vertical_layout .setSpacing (2 )

        self .skip_words_label_widget =QLabel ()
        skip_words_vertical_layout .addWidget (self .skip_words_label_widget )

        skip_input_and_button_layout =QHBoxLayout ()
        skip_input_and_button_layout =QHBoxLayout ()
        skip_input_and_button_layout .setContentsMargins (0 ,0 ,0 ,0 )
        skip_input_and_button_layout .setSpacing (10 )
        self .skip_words_input =QLineEdit ()
        self .skip_words_input .setPlaceholderText ("e.g., WM, WIP, sketch, preview")
        skip_input_and_button_layout .addWidget (self .skip_words_input ,1 )

        self .skip_scope_toggle_button =QPushButton ()
        self ._update_skip_scope_button_text ()
        self .skip_scope_toggle_button .setStyleSheet ("padding: 4px 10px;")
        self .skip_scope_toggle_button .setMinimumWidth (100 )
        skip_input_and_button_layout .addWidget (self .skip_scope_toggle_button ,0 )
        skip_words_vertical_layout .addLayout (skip_input_and_button_layout )
        word_manipulation_outer_layout .addWidget (skip_words_widget ,7 )
        remove_words_widget =QWidget ()
        remove_words_vertical_layout =QVBoxLayout (remove_words_widget )
        remove_words_vertical_layout .setContentsMargins (0 ,0 ,0 ,0 )
        remove_words_vertical_layout .setSpacing (2 )
        self .remove_from_filename_label_widget =QLabel ()
        remove_words_vertical_layout .addWidget (self .remove_from_filename_label_widget )
        self .remove_from_filename_input =QLineEdit ()
        self .remove_from_filename_input .setPlaceholderText ("e.g., patreon, HD")
        remove_words_vertical_layout .addWidget (self .remove_from_filename_input )
        word_manipulation_outer_layout .addWidget (remove_words_widget ,3 )

        left_layout .addWidget (word_manipulation_container_widget )


        file_filter_layout =QVBoxLayout ()
        file_filter_layout .setContentsMargins (0 ,10 ,0 ,0 )
        file_filter_layout .addWidget (QLabel ("Filter Files:"))
        radio_button_layout =QHBoxLayout ()
        radio_button_layout .setSpacing (10 )
        self .radio_group =QButtonGroup (self )
        self .radio_all =QRadioButton ("All")
        self .radio_images =QRadioButton ("Images/GIFs")
        self .radio_videos =QRadioButton ("Videos")
        self .radio_only_archives =QRadioButton ("📦 Only Archives")
        self .radio_only_audio =QRadioButton ("🎧 Only Audio")
        self .radio_only_links =QRadioButton ("🔗 Only Links")
        self .radio_all .setChecked (True )
        self .radio_group .addButton (self .radio_all )
        self .radio_group .addButton (self .radio_images )
        self .radio_group .addButton (self .radio_videos )
        self .radio_group .addButton (self .radio_only_archives )
        self .radio_group .addButton (self .radio_only_audio )
        self .radio_group .addButton (self .radio_only_links )
        radio_button_layout .addWidget (self .radio_all )
        radio_button_layout .addWidget (self .radio_images )
        radio_button_layout .addWidget (self .radio_videos )
        radio_button_layout .addWidget (self .radio_only_archives )
        radio_button_layout .addWidget (self .radio_only_audio )
        file_filter_layout .addLayout (radio_button_layout )
        left_layout .addLayout (file_filter_layout )

        self .favorite_mode_checkbox =QCheckBox ()
        self .favorite_mode_checkbox .setChecked (False )
        radio_button_layout .addWidget (self .radio_only_links )
        radio_button_layout .addWidget (self .favorite_mode_checkbox )
        radio_button_layout .addStretch (1 )
        checkboxes_group_layout =QVBoxLayout ()
        checkboxes_group_layout .setSpacing (10 )

        row1_layout =QHBoxLayout ()
        row1_layout .setSpacing (10 )
        self .skip_zip_checkbox =QCheckBox ("Skip .zip")
        self .skip_zip_checkbox .setChecked (True )
        row1_layout .addWidget (self .skip_zip_checkbox )
        self .skip_rar_checkbox =QCheckBox ("Skip .rar")
        self .skip_rar_checkbox .setChecked (True )
        row1_layout .addWidget (self .skip_rar_checkbox )
        self .download_thumbnails_checkbox =QCheckBox ("Download Thumbnails Only")
        self .download_thumbnails_checkbox .setChecked (False )
        row1_layout .addWidget (self .download_thumbnails_checkbox )

        self .scan_content_images_checkbox =QCheckBox ("Scan Content for Images")
        self .scan_content_images_checkbox .setChecked (self .scan_content_images_setting )
        row1_layout .addWidget (self .scan_content_images_checkbox )

        self .compress_images_checkbox =QCheckBox ("Compress to WebP")
        self .compress_images_checkbox .setChecked (False )
        self .compress_images_checkbox .setToolTip ("Compress images > 1.5MB to WebP format (requires Pillow).")
        row1_layout .addWidget (self .compress_images_checkbox )

        row1_layout .addStretch (1 )
        checkboxes_group_layout .addLayout (row1_layout )

        advanced_settings_label =QLabel ("⚙️ Advanced Settings:")
        checkboxes_group_layout .addWidget (advanced_settings_label )

        advanced_row1_layout =QHBoxLayout ()
        advanced_row1_layout .setSpacing (10 )
        self .use_subfolders_checkbox =QCheckBox ("Separate Folders by Name/Title")
        self .use_subfolders_checkbox .setChecked (True )
        self .use_subfolders_checkbox .toggled .connect (self .update_ui_for_subfolders )
        advanced_row1_layout .addWidget (self .use_subfolders_checkbox )
        self .use_subfolder_per_post_checkbox =QCheckBox ("Subfolder per Post")
        self .use_subfolder_per_post_checkbox .setChecked (False )
        self .use_subfolder_per_post_checkbox .toggled .connect (self .update_ui_for_subfolders )
        advanced_row1_layout .addWidget (self .use_subfolder_per_post_checkbox )

        self .use_cookie_checkbox =QCheckBox ("Use Cookie")
        self .use_cookie_checkbox .setChecked (self .use_cookie_setting )

        self .cookie_text_input =QLineEdit ()
        self .cookie_text_input .setPlaceholderText ("if no Select cookies.txt)")
        self .cookie_text_input .setMinimumHeight (28 )
        self .cookie_text_input .setText (self .cookie_text_setting )

        advanced_row1_layout .addWidget (self .use_cookie_checkbox )
        advanced_row1_layout .addWidget (self .cookie_text_input ,2 )

        self .cookie_browse_button =QPushButton ("Browse...")
        self .cookie_browse_button .setFixedWidth (80 )
        self .cookie_browse_button .setStyleSheet ("padding: 4px 8px;")
        advanced_row1_layout .addWidget (self .cookie_browse_button )

        advanced_row1_layout .addStretch (1 )
        checkboxes_group_layout .addLayout (advanced_row1_layout )

        advanced_row2_layout =QHBoxLayout ()
        advanced_row2_layout .setSpacing (10 )

        multithreading_layout =QHBoxLayout ()
        multithreading_layout .setContentsMargins (0 ,0 ,0 ,0 )
        self .use_multithreading_checkbox =QCheckBox ("Use Multithreading")
        self .use_multithreading_checkbox .setChecked (True )
        multithreading_layout .addWidget (self .use_multithreading_checkbox )
        self .thread_count_label =QLabel ("Threads:")
        multithreading_layout .addWidget (self .thread_count_label )
        self .thread_count_input =QLineEdit ()
        self .thread_count_input .setFixedWidth (40 )
        self .thread_count_input .setText ("4")
        self .thread_count_input .setValidator (QIntValidator (1 ,MAX_THREADS ))
        multithreading_layout .addWidget (self .thread_count_input )
        advanced_row2_layout .addLayout (multithreading_layout )

        self .external_links_checkbox =QCheckBox ("Show External Links in Log")
        self .external_links_checkbox .setChecked (False )
        advanced_row2_layout .addWidget (self .external_links_checkbox )

        self .manga_mode_checkbox =QCheckBox ("Manga/Comic Mode")
        self .manga_mode_checkbox .setChecked (False )

        advanced_row2_layout .addWidget (self .manga_mode_checkbox )


        advanced_row2_layout .addStretch (1 )
        checkboxes_group_layout .addLayout (advanced_row2_layout )
        left_layout .addLayout (checkboxes_group_layout )

        self .standard_action_buttons_widget =QWidget ()
        btn_layout =QHBoxLayout ()
        btn_layout .setContentsMargins (0 ,0 ,0 ,0 )
        btn_layout .setSpacing (10 )
        self .download_btn =QPushButton ("⬇️ Start Download")
        self .download_btn .setStyleSheet ("padding: 4px 12px; font-weight: bold;")
        self .download_btn .clicked .connect (self .start_download )

        self .pause_btn =QPushButton ("⏸️ Pause Download")
        self .pause_btn .setEnabled (False )
        self .pause_btn .setStyleSheet ("padding: 4px 12px;")
        self .pause_btn .clicked .connect (self ._handle_pause_resume_action )

        self .cancel_btn =QPushButton ("❌ Cancel & Reset UI")

        self .cancel_btn .setEnabled (False )
        self .cancel_btn .setStyleSheet ("padding: 4px 12px;")
        self .cancel_btn .clicked .connect (self .cancel_download_button_action )

        self .error_btn =QPushButton ("Error")
        self .error_btn .setToolTip ("View error details (functionality TBD).")
        self .error_btn .setStyleSheet ("padding: 4px 8px;")
        self .error_btn .setEnabled (True )
        btn_layout .addWidget (self .download_btn )
        btn_layout .addWidget (self .pause_btn )
        btn_layout .addWidget (self .cancel_btn )
        btn_layout .addWidget (self .error_btn )
        self .standard_action_buttons_widget .setLayout (btn_layout )

        self .bottom_action_buttons_stack =QStackedWidget ()
        self .bottom_action_buttons_stack .addWidget (self .standard_action_buttons_widget )
        self .bottom_action_buttons_stack .addWidget (self .favorite_action_buttons_widget )
        left_layout .addWidget (self .bottom_action_buttons_stack )
        left_layout .addSpacing (10 )


        known_chars_label_layout =QHBoxLayout ()
        known_chars_label_layout .setSpacing (10 )
        self .known_chars_label =QLabel ("🎭 Known Shows/Characters (for Folder Names):")
        known_chars_label_layout .addWidget (self .known_chars_label )
        self .open_known_txt_button =QPushButton ("Open Known.txt")
        self .open_known_txt_button .setStyleSheet ("padding: 4px 8px;")
        self .open_known_txt_button .setFixedWidth (120 )
        known_chars_label_layout .addWidget (self .open_known_txt_button )
        self .character_search_input =QLineEdit ()
        self .character_search_input .setPlaceholderText ("Search characters...")
        known_chars_label_layout .addWidget (self .character_search_input ,1 )
        left_layout .addLayout (known_chars_label_layout )

        self .character_list =QListWidget ()
        self .character_list .setSelectionMode (QListWidget .ExtendedSelection )
        left_layout .addWidget (self .character_list ,1 )

        char_manage_layout =QHBoxLayout ()
        char_manage_layout .setSpacing (10 )
        self .new_char_input =QLineEdit ()
        self .new_char_input .setPlaceholderText ("Add new show/character name")
        self .new_char_input .setStyleSheet ("padding: 3px 5px;")

        self .add_char_button =QPushButton ("➕ Add")
        self .add_char_button .setStyleSheet ("padding: 4px 10px;")

        self .add_to_filter_button =QPushButton ("⤵️ Add to Filter")
        self .add_to_filter_button .setToolTip ("Select names from 'Known Shows/Characters' list to add to the 'Filter by Character(s)' field above.")
        self .add_to_filter_button .setStyleSheet ("padding: 4px 10px;")

        self .delete_char_button =QPushButton ("🗑️ Delete Selected")
        self .delete_char_button .setToolTip ("Delete the selected name(s) from the 'Known Shows/Characters' list.")
        self .delete_char_button .setStyleSheet ("padding: 4px 10px;")

        self .add_char_button .clicked .connect (self ._handle_ui_add_new_character )
        self .new_char_input .returnPressed .connect (self .add_char_button .click )
        self .delete_char_button .clicked .connect (self .delete_selected_character )

        char_manage_layout .addWidget (self .new_char_input ,2 )
        char_manage_layout .addWidget (self .add_char_button ,0 )

        self .known_names_help_button =QPushButton ("?")
        self .known_names_help_button .setFixedWidth (35 )
        self .known_names_help_button .setStyleSheet ("padding: 4px 6px;")
        self .known_names_help_button .clicked .connect (self ._show_feature_guide )

        self .history_button =QPushButton ("📜")
        self .history_button .setFixedWidth (35 )
        self .history_button .setStyleSheet ("padding: 4px 6px;")
        self .history_button .setToolTip (self ._tr ("history_button_tooltip_text","View download history"))

        self .future_settings_button =QPushButton ("⚙️")
        self .future_settings_button .setFixedWidth (35 )
        self .future_settings_button .setStyleSheet ("padding: 4px 6px;")
        self .future_settings_button .clicked .connect (self ._show_future_settings_dialog )
        char_manage_layout .addWidget (self .add_to_filter_button ,1 )
        char_manage_layout .addWidget (self .delete_char_button ,1 )
        char_manage_layout .addWidget (self .known_names_help_button ,0 )
        char_manage_layout .addWidget (self .history_button ,0 )
        char_manage_layout .addWidget (self .future_settings_button ,0 )
        left_layout .addLayout (char_manage_layout )
        left_layout .addStretch (0 )

        log_title_layout =QHBoxLayout ()
        self .progress_log_label =QLabel ("📜 Progress Log:")
        log_title_layout .addWidget (self .progress_log_label )
        log_title_layout .addStretch (1 )

        self .link_search_input =QLineEdit ()
        self .link_search_input .setPlaceholderText ("Search Links...")
        self .link_search_input .setVisible (False )

        log_title_layout .addWidget (self .link_search_input )
        self .link_search_button =QPushButton ("🔍")
        self .link_search_button .setVisible (False )
        self .link_search_button .setFixedWidth (30 )
        self .link_search_button .setStyleSheet ("padding: 4px 4px;")
        log_title_layout .addWidget (self .link_search_button )

        self .manga_rename_toggle_button =QPushButton ()
        self .manga_rename_toggle_button .setVisible (False )
        self .manga_rename_toggle_button .setFixedWidth (140 )
        self .manga_rename_toggle_button .setStyleSheet ("padding: 4px 8px;")
        self ._update_manga_filename_style_button_text ()
        log_title_layout .addWidget (self .manga_rename_toggle_button )
        self .manga_date_prefix_input =QLineEdit ()
        self .manga_date_prefix_input .setPlaceholderText ("Prefix for Manga Filenames")
        self .manga_date_prefix_input .setVisible (False )

        log_title_layout .addWidget (self .manga_date_prefix_input )

        self .multipart_toggle_button =QPushButton ()
        self .multipart_toggle_button .setToolTip ("Toggle between Multi-part and Single-stream downloads for large files.")
        self .multipart_toggle_button .setFixedWidth (130 )
        self .multipart_toggle_button .setStyleSheet ("padding: 4px 8px;")
        self ._update_multipart_toggle_button_text ()
        log_title_layout .addWidget (self .multipart_toggle_button )

        self .EYE_ICON ="\U0001F441"
        self .CLOSED_EYE_ICON ="\U0001F648"
        self .log_verbosity_toggle_button =QPushButton (self .EYE_ICON )
        self .log_verbosity_toggle_button .setFixedWidth (45 )
        self .log_verbosity_toggle_button .setStyleSheet ("font-size: 11pt; padding: 4px 2px;")
        log_title_layout .addWidget (self .log_verbosity_toggle_button )

        self .reset_button =QPushButton ("🔄 Reset")
        self .reset_button .setFixedWidth (80 )
        self .reset_button .setStyleSheet ("padding: 4px 8px;")
        log_title_layout .addWidget (self .reset_button )
        right_layout .addLayout (log_title_layout )

        self .log_splitter =QSplitter (Qt .Vertical )

        self .log_view_stack =QStackedWidget ()

        self .main_log_output =QTextEdit ()
        self .main_log_output .setReadOnly (True )
        self .main_log_output .setLineWrapMode (QTextEdit .NoWrap )
        self .log_view_stack .addWidget (self .main_log_output )

        self .missed_character_log_output =QTextEdit ()
        self .missed_character_log_output .setReadOnly (True )
        self .missed_character_log_output .setLineWrapMode (QTextEdit .NoWrap )
        self .log_view_stack .addWidget (self .missed_character_log_output )

        self .external_log_output =QTextEdit ()
        self .external_log_output .setReadOnly (True )
        self .external_log_output .setLineWrapMode (QTextEdit .NoWrap )
        self .external_log_output .hide ()

        self .log_splitter .addWidget (self .log_view_stack )
        self .log_splitter .addWidget (self .external_log_output )
        self .log_splitter .setSizes ([self .height (),0 ])
        right_layout .addWidget (self .log_splitter ,1 )

        export_button_layout =QHBoxLayout ()
        export_button_layout .addStretch (1 )
        self .export_links_button =QPushButton (self ._tr ("export_links_button_text","Export Links"))
        self .export_links_button .setFixedWidth (100 )
        self .export_links_button .setStyleSheet ("padding: 4px 8px; margin-top: 5px;")
        self .export_links_button .setEnabled (False )
        self .export_links_button .setVisible (False )
        export_button_layout .addWidget (self .export_links_button )

        self .download_extracted_links_button =QPushButton (self ._tr ("download_extracted_links_button_text","Download"))
        self .download_extracted_links_button .setFixedWidth (100 )
        self .download_extracted_links_button .setStyleSheet ("padding: 4px 8px; margin-top: 5px;")
        self .download_extracted_links_button .setEnabled (False )
        self .download_extracted_links_button .setVisible (False )
        export_button_layout .addWidget (self .download_extracted_links_button )
        self .log_display_mode_toggle_button =QPushButton ()
        self .log_display_mode_toggle_button .setFixedWidth (120 )
        self .log_display_mode_toggle_button .setStyleSheet ("padding: 4px 8px; margin-top: 5px;")
        self .log_display_mode_toggle_button .setVisible (False )
        export_button_layout .addWidget (self .log_display_mode_toggle_button )
        right_layout .addLayout (export_button_layout )


        self .progress_label =QLabel ("Progress: Idle")
        self .progress_label .setStyleSheet ("padding-top: 5px; font-style: italic;")
        right_layout .addWidget (self .progress_label )
        self .file_progress_label =QLabel ("")
        self .file_progress_label .setToolTip ("Shows the progress of individual file downloads, including speed and size.")
        self .file_progress_label .setWordWrap (True )
        self .file_progress_label .setStyleSheet ("padding-top: 2px; font-style: italic; color: #A0A0A0;")
        right_layout .addWidget (self .file_progress_label )


        self .main_splitter .addWidget (left_panel_widget )
        self .main_splitter .addWidget (right_panel_widget )

        if self .width ()==0 or self .height ()==0 :
            initial_width =1024 
        else :
            initial_width =self .width ()
        left_width =int (initial_width *0.35 )
        right_width =initial_width -left_width 
        self .main_splitter .setSizes ([left_width ,right_width ])

        top_level_layout =QHBoxLayout (self )
        top_level_layout .setContentsMargins (0 ,0 ,0 ,0 )
        top_level_layout .addWidget (self .main_splitter )

        self .update_ui_for_subfolders (self .use_subfolders_checkbox .isChecked ())
        self .update_external_links_setting (self .external_links_checkbox .isChecked ())
        self .update_multithreading_label (self .thread_count_input .text ())
        self .update_page_range_enabled_state ()
        if self .manga_mode_checkbox :
            self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ())
        if hasattr (self ,'link_input'):self .link_input .textChanged .connect (lambda :self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False ))

        self ._load_creator_name_cache_from_json ()
        self .load_known_names_from_util ()
        self ._update_cookie_input_visibility (self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False )
        self ._handle_multithreading_toggle (self .use_multithreading_checkbox .isChecked ())
        if hasattr (self ,'radio_group')and self .radio_group .checkedButton ():
            self ._handle_filter_mode_change (self .radio_group .checkedButton (),True )
        self ._update_manga_filename_style_button_text ()
        self ._update_skip_scope_button_text ()
        self ._update_char_filter_scope_button_text ()
        self ._update_multithreading_for_date_mode ()
        if hasattr (self ,'download_thumbnails_checkbox'):
            self ._handle_thumbnail_mode_change (self .download_thumbnails_checkbox .isChecked ())
        if hasattr (self ,'favorite_mode_checkbox'):

            self ._handle_favorite_mode_toggle (False )

    def _load_persistent_history (self ):
        """Loads download history from a persistent file."""
        self .log_signal .emit (f"📜 Attempting to load history from: {self .persistent_history_file }")
        if os .path .exists (self .persistent_history_file ):
            try :
                with open (self .persistent_history_file ,'r',encoding ='utf-8')as f :
                    loaded_data =json .load (f )
                
                if isinstance (loaded_data ,dict ):
                    self .last_downloaded_files_details .clear ()
                    self .last_downloaded_files_details .extend (loaded_data .get ("last_downloaded_files",[]))
                    self .final_download_history_entries =loaded_data .get ("first_processed_posts",[])
                    self .log_signal .emit (f"✅ Loaded {len (self .last_downloaded_files_details )} last downloaded files and {len (self .final_download_history_entries )} first processed posts from persistent history.")
                elif loaded_data is None and os .path .getsize (self .persistent_history_file )==0 :
                    self .log_signal .emit (f"ℹ️ Persistent history file is empty. Initializing with empty history.")
                    self .final_download_history_entries =[]
                    self .last_downloaded_files_details .clear ()
                elif isinstance(loaded_data, list): # Handle old format where only first_processed_posts was saved
                    self.log_signal.emit("⚠️ Persistent history file is in old format (only first_processed_posts). Converting to new format.")
                    self.final_download_history_entries = loaded_data
                    self.last_downloaded_files_details.clear()
                    self._save_persistent_history() # Save in new format immediately
                else :
                    self .log_signal .emit (f"⚠️ Persistent history file has incorrect format. Expected list, got {type (loaded_history )}. Ignoring.")
                    self .final_download_history_entries =[]
            except json .JSONDecodeError :
                self .log_signal .emit (f"⚠️ Error decoding persistent history file. It might be corrupted. Ignoring.")
                self .final_download_history_entries =[]
            except Exception as e :
                self .log_signal .emit (f"❌ Error loading persistent history: {e }")
                self .final_download_history_entries =[]
        else :
            self .log_signal .emit (f"⚠️ Persistent history file NOT FOUND at: {self .persistent_history_file }. Starting with empty history.")
            self .final_download_history_entries =[]
            self ._save_persistent_history ()

    def _save_persistent_history (self ):
        """Saves download history to a persistent file."""
        self .log_signal .emit (f"📜 Attempting to save history to: {self .persistent_history_file }")
        try :
            history_dir =os .path .dirname (self .persistent_history_file )
            self .log_signal .emit (f"   History directory: {history_dir }")
            if not os .path .exists (history_dir ):
                os .makedirs (history_dir ,exist_ok =True )
                self .log_signal .emit (f"   Created history directory: {history_dir }")
            
            history_data = {
                "last_downloaded_files": list(self.last_downloaded_files_details),
                "first_processed_posts": self.final_download_history_entries
            }
            with open (self .persistent_history_file ,'w',encoding ='utf-8')as f :
                json .dump (history_data ,f ,indent =2 )
            self .log_signal .emit (f"✅ Saved {len (self .final_download_history_entries )} history entries to: {self .persistent_history_file }")
        except Exception as e :
            self .log_signal .emit (f"❌ Error saving persistent history to {self .persistent_history_file }: {e }")
    def _load_creator_name_cache_from_json (self ):
        """Loads creator id-name-service mappings from creators.json into self.creator_name_cache."""
        self .log_signal .emit ("ℹ️ Attempting to load creators.json for creator name cache.")

        if getattr (sys ,'frozen',False )and hasattr (sys ,'_MEIPASS'):
            base_path_for_creators =sys ._MEIPASS 
        else :
            base_path_for_creators =self .app_base_dir 

        creators_file_path =os .path .join (base_path_for_creators ,"creators.json")

        if not os .path .exists (creators_file_path ):
            self .log_signal .emit (f"⚠️ 'creators.json' not found at {creators_file_path }. Creator name cache will be empty.")
            self .creator_name_cache .clear ()
            return 

        try :
            with open (creators_file_path ,'r',encoding ='utf-8')as f :
                loaded_data =json .load (f )

            creators_list =[]
            if isinstance (loaded_data ,list )and len (loaded_data )>0 and isinstance (loaded_data [0 ],list ):
                creators_list =loaded_data [0 ]
            elif isinstance (loaded_data ,list )and all (isinstance (item ,dict )for item in loaded_data ):
                creators_list =loaded_data 
            else :
                self .log_signal .emit (f"⚠️ 'creators.json' has an unexpected format. Creator name cache may be incomplete.")

            for creator_data in creators_list :
                creator_id =creator_data .get ("id")
                name =creator_data .get ("name")
                service =creator_data .get ("service")
                if creator_id and name and service :
                    self .creator_name_cache [(service .lower (),str (creator_id ))]=name 
            self .log_signal .emit (f"✅ Successfully loaded {len (self .creator_name_cache )} creator names into cache from 'creators.json'.")
        except Exception as e :
            self .log_signal .emit (f"❌ Error loading 'creators.json' for name cache: {e }")
            self .creator_name_cache .clear ()

    def _show_download_history_dialog (self ):
        """Shows the dialog with the finalized download history."""
        last_3_downloaded =list (self .last_downloaded_files_details )
        first_processed =self .final_download_history_entries 

        if not last_3_downloaded and not first_processed :
            QMessageBox .information (
            self ,
            self ._tr ("download_history_dialog_title_empty","Download History (Empty)"),
            self ._tr ("no_download_history_header","No Downloads Yet")
            )
            return 

        dialog =DownloadHistoryDialog (last_3_downloaded ,first_processed ,self ,self )
        dialog .exec_ ()

    def _handle_actual_file_downloaded (self ,file_details_dict ):
        """Handles a successfully downloaded file for the 'last 3 downloaded' history."""
        if not file_details_dict :
            return 
        file_details_dict ['download_timestamp']=time .time ()
        creator_key =(file_details_dict .get ('service','').lower (),str (file_details_dict .get ('user_id','')))
        file_details_dict ['creator_display_name']=self .creator_name_cache .get (creator_key ,file_details_dict .get ('folder_context_name','Unknown Creator/Series'))
        self .last_downloaded_files_details .append (file_details_dict )


    def _handle_file_successfully_downloaded (self ,history_entry_dict ):
        """Handles a successfully downloaded file for history logging."""
        if len (self .download_history_log )>=self .download_history_log .maxlen :
            self .download_history_log .popleft ()
        self .download_history_log .append (history_entry_dict )


    def _handle_actual_file_downloaded (self ,file_details_dict ):
        """Handles a successfully downloaded file for the 'last 3 downloaded' history."""
        if not file_details_dict :
            return 

        file_details_dict ['download_timestamp']=time .time ()


        creator_key =(
        file_details_dict .get ('service','').lower (),
        str (file_details_dict .get ('user_id',''))
        )
        creator_display_name =self .creator_name_cache .get (creator_key ,file_details_dict .get ('folder_context_name','Unknown Creator'))
        file_details_dict ['creator_display_name']=creator_display_name 

        self .last_downloaded_files_details .append (file_details_dict )


    def _handle_favorite_mode_toggle (self ,checked ):
        if not self .url_or_placeholder_stack or not self .bottom_action_buttons_stack :
            return 

            self ._handle_favorite_mode_toggle (self .favorite_mode_checkbox .isChecked ())
        self ._update_favorite_scope_button_text ()
        if hasattr (self ,'link_input'):
            self .last_link_input_text_for_queue_sync =self .link_input .text ()

    def _update_download_extracted_links_button_state (self ):
        if hasattr (self ,'download_extracted_links_button')and self .download_extracted_links_button :
            is_only_links =self .radio_only_links and self .radio_only_links .isChecked ()
            if not is_only_links :
                self .download_extracted_links_button .setEnabled (False )
                return 

            supported_platforms_for_button ={'mega','google drive','dropbox'}
            has_supported_links =any (
            link_info [3 ].lower ()in supported_platforms_for_button for link_info in self .extracted_links_cache 
            )
            self .download_extracted_links_button .setEnabled (is_only_links and has_supported_links )

    def _show_download_extracted_links_dialog (self ):
        """Shows the placeholder dialog for downloading extracted links."""
        if not (self .radio_only_links and self .radio_only_links .isChecked ()):
            self .log_signal .emit ("ℹ️ Download extracted links button clicked, but not in 'Only Links' mode.")
            return 

        supported_platforms ={'mega','google drive','dropbox'}
        links_to_show_in_dialog =[]
        for link_data_tuple in self .extracted_links_cache :
            platform =link_data_tuple [3 ].lower ()
            if platform in supported_platforms :
                links_to_show_in_dialog .append ({
                'title':link_data_tuple [0 ],
                'link_text':link_data_tuple [1 ],
                'url':link_data_tuple [2 ],
                'platform':platform ,
                'key':link_data_tuple [4 ]
                })

        if not links_to_show_in_dialog :
            QMessageBox .information (self ,"No Supported Links","No Mega, Google Drive, or Dropbox links were found in the extracted links.")
            return 

        dialog =DownloadExtractedLinksDialog (links_to_show_in_dialog ,self ,self )
        dialog .download_requested .connect (self ._handle_extracted_links_download_request )
        dialog .exec_ ()

    def _handle_extracted_links_download_request (self ,selected_links_info ):
        if not selected_links_info :
            self .log_signal .emit ("ℹ️ No links selected for download from dialog.")
            return 


        if self .radio_only_links and self .radio_only_links .isChecked ()and self .only_links_log_display_mode ==LOG_DISPLAY_DOWNLOAD_PROGRESS :
            self .main_log_output .clear ()
            self .log_signal .emit ("ℹ️ Displaying Mega download progress (extracted links hidden)...")
            self .mega_download_log_preserved_once =False 

        current_main_dir =self .dir_input .text ().strip ()
        download_dir_for_mega =""

        if current_main_dir and os .path .isdir (current_main_dir ):
            download_dir_for_mega =current_main_dir 
            self .log_signal .emit (f"ℹ️ Using existing main download location for external links: {download_dir_for_mega }")
        else :
            if not current_main_dir :
                self .log_signal .emit ("ℹ️ Main download location is empty. Prompting for download folder.")
            else :
                self .log_signal .emit (
                f"⚠️ Main download location '{current_main_dir }' is not a valid directory. Prompting for download folder.")


            suggestion_path =current_main_dir if current_main_dir else QStandardPaths .writableLocation (QStandardPaths .DownloadLocation )

            chosen_dir =QFileDialog .getExistingDirectory (
            self ,
            self ._tr ("select_download_folder_mega_dialog_title","Select Download Folder for External Links"),
            suggestion_path ,
            options =QFileDialog .ShowDirsOnly |QFileDialog .DontUseNativeDialog 
            )

            if not chosen_dir :
                self .log_signal .emit ("ℹ️ External links download cancelled - no download directory selected from prompt.")
                return 
            download_dir_for_mega =chosen_dir 


        self .log_signal .emit (f"ℹ️ Preparing to download {len (selected_links_info )} selected external link(s) to: {download_dir_for_mega }")
        if not os .path .exists (download_dir_for_mega ):
            self .log_signal .emit (f"❌ Critical Error: Selected download directory '{download_dir_for_mega }' does not exist.")
            return 


        tasks_for_thread =selected_links_info 

        if self .external_link_download_thread and self .external_link_download_thread .isRunning ():
            QMessageBox .warning (self ,"Busy","Another external link download is already in progress.")
            return 

        self .external_link_download_thread =ExternalLinkDownloadThread (
        tasks_for_thread ,
        download_dir_for_mega ,
        self .log_signal .emit ,
        self 
        )
        self .external_link_download_thread .finished .connect (self ._on_external_link_download_thread_finished )

        self .external_link_download_thread .progress_signal .connect (self .handle_main_log )
        self .external_link_download_thread .file_complete_signal .connect (self ._on_single_external_file_complete )



        self .set_ui_enabled (False )

        self .progress_label .setText (self ._tr ("progress_processing_post_text","Progress: Processing post {processed_posts}...").format (processed_posts =f"External Links (0/{len (tasks_for_thread )})"))
        self .external_link_download_thread .start ()

    def _on_external_link_download_thread_finished (self ):
        self .log_signal .emit ("✅ External link download thread finished.")
        self .progress_label .setText (f"{self ._tr ('status_completed','Completed')}: External link downloads. {self ._tr ('ready_for_new_task_text','Ready for new task.')}")

        self .mega_download_log_preserved_once =True 
        self .log_signal .emit ("INTERNAL: mega_download_log_preserved_once SET to True.")

        if self .radio_only_links and self .radio_only_links .isChecked ():
            self .log_signal .emit (HTML_PREFIX +"<br><hr>--- End of Mega Download Log ---<br>")



        self .set_ui_enabled (True )



        if self .mega_download_log_preserved_once :
            self .mega_download_log_preserved_once =False 
            self .log_signal .emit ("INTERNAL: mega_download_log_preserved_once RESET to False.")

        if self .external_link_download_thread :
            self .external_link_download_thread .deleteLater ()
            self .external_link_download_thread =None 

    def _on_single_external_file_complete (self ,url ,success ):


        pass 
    def _show_future_settings_dialog (self ):
        """Shows the placeholder dialog for future settings."""
        dialog =FutureSettingsDialog (self )
        dialog =FutureSettingsDialog (self ,self )
        dialog .exec_ ()

    def _sync_queue_with_link_input (self ,current_text ):
        """
        Synchronizes the favorite_download_queue with the link_input text.
        Removes creators from the queue if their names are removed from the input field.
        Only affects items added via 'creator_popup_selection'.
        """
        if not self .favorite_download_queue :
            self .last_link_input_text_for_queue_sync =current_text 
            return 

        current_names_in_input ={name .strip ().lower ()for name in current_text .split (',')if name .strip ()}

        queue_copy =list (self .favorite_download_queue )
        removed_count =0 

        for item in queue_copy :
            if item .get ('type')=='creator_popup_selection':
                item_name_lower =item .get ('name','').lower ()
                if item_name_lower and item_name_lower not in current_names_in_input :
                    try :
                        self .favorite_download_queue .remove (item )
                        self .log_signal .emit (f"ℹ️ Creator '{item .get ('name')}' removed from download queue due to removal from URL input.")
                        removed_count +=1 
                    except ValueError :
                        self .log_signal .emit (f"⚠️ Tried to remove '{item .get ('name')}' from queue, but it was not found (sync).")

        self .last_link_input_text_for_queue_sync =current_text 

    def _browse_cookie_file (self ):
        """Opens a file dialog to select a cookie file."""
        start_dir =QStandardPaths .writableLocation (QStandardPaths .DownloadLocation )
        if not start_dir :
            start_dir =os .path .dirname (self .config_file )

        filepath ,_ =QFileDialog .getOpenFileName (self ,"Select Cookie File",start_dir ,"Text files (*.txt);;All files (*)")
        if filepath :
            self .selected_cookie_filepath =filepath 
            self .log_signal .emit (f"ℹ️ Selected cookie file: {filepath }")
            if hasattr (self ,'cookie_text_input'):
                self .cookie_text_input .blockSignals (True )
                self .cookie_text_input .setText (filepath )
            self .cookie_text_input .setToolTip (self ._tr ("cookie_text_input_tooltip_file_selected","Using selected cookie file: {filepath}").format (filepath =filepath ))
            self .cookie_text_input .setPlaceholderText (self ._tr ("cookie_text_input_placeholder_with_file_selected_text","Using selected cookie file (see Browse...)"))
            self .cookie_text_input .setReadOnly (True )
            self .cookie_text_input .setPlaceholderText ("")
            self .cookie_text_input .blockSignals (False )

    def _update_cookie_input_placeholders_and_tooltips (self ):
        if hasattr (self ,'cookie_text_input'):
            if self .selected_cookie_filepath :
                self .cookie_text_input .setPlaceholderText (self ._tr ("cookie_text_input_placeholder_with_file_selected_text","Using selected cookie file..."))
                self .cookie_text_input .setToolTip (self ._tr ("cookie_text_input_tooltip_file_selected","Using selected cookie file: {filepath}").format (filepath =self .selected_cookie_filepath ))
            else :
                self .cookie_text_input .setPlaceholderText (self ._tr ("cookie_text_input_placeholder_no_file_selected_text","Cookie string (if no cookies.txt selected)"))
                self .cookie_text_input .setToolTip (self ._tr ("cookie_text_input_tooltip","Enter your cookie string directly..."))
                self .cookie_text_input .setReadOnly (True )
                self .cookie_text_input .setPlaceholderText ("")
                self .cookie_text_input .blockSignals (False )

    def _center_on_screen (self ):
        """Centers the widget on the screen."""
        try :
            primary_screen =QApplication .primaryScreen ()
            if not primary_screen :
                screens =QApplication .screens ()
                if not screens :return 
                primary_screen =screens [0 ]

            available_geo =primary_screen .availableGeometry ()
            widget_geo =self .frameGeometry ()

            x =available_geo .x ()+(available_geo .width ()-widget_geo .width ())//2 
            y =available_geo .y ()+(available_geo .height ()-widget_geo .height ())//2 
            self .move (x ,y )
        except Exception as e :
            self .log_signal .emit (f"⚠️ Error centering window: {e }")

    def _handle_cookie_text_manual_change (self ,text ):
        """Handles manual changes to the cookie text input, especially clearing a browsed path."""
        if not hasattr (self ,'cookie_text_input')or not hasattr (self ,'use_cookie_checkbox'):
            return 
        if self .selected_cookie_filepath and not text .strip ()and self .use_cookie_checkbox .isChecked ():
            self .selected_cookie_filepath =None 
            self .cookie_text_input .setReadOnly (False )
            self ._update_cookie_input_placeholders_and_tooltips ()
            self .log_signal .emit ("ℹ️ Browsed cookie file path cleared from input. Switched to manual cookie string mode.")


    def get_dark_theme (self ):
        return """
        QWidget { background-color: #2E2E2E; color: #E0E0E0; font-family: Segoe UI, Arial, sans-serif; font-size: 10pt; }
        QLineEdit, QListWidget { background-color: #3C3F41; border: 1px solid #5A5A5A; padding: 5px; color: #F0F0F0; border-radius: 4px; }
        QTextEdit { background-color: #3C3F41; border: 1px solid #5A5A5A; padding: 5px;
                          color: #F0F0F0; border-radius: 4px; 
                          font-family: Consolas, Courier New, monospace; font-size: 9.5pt; }
        QPushButton { background-color: #555; color: #F0F0F0; border: 1px solid #6A6A6A; padding: 6px 12px; border-radius: 4px; min-height: 22px; }
        QPushButton:hover { background-color: #656565; border: 1px solid #7A7A7A; }
        QPushButton:pressed { background-color: #4A4A4A; }
        QPushButton:disabled { background-color: #404040; color: #888; border-color: #555; }
        QLabel { font-weight: bold; padding-top: 4px; padding-bottom: 2px; color: #C0C0C0; }
        QRadioButton, QCheckBox { spacing: 5px; color: #E0E0E0; padding-top: 4px; padding-bottom: 4px; }
        QRadioButton::indicator, QCheckBox::indicator { width: 14px; height: 14px; }
        QListWidget { alternate-background-color: #353535; border: 1px solid #5A5A5A; }
        QListWidget::item:selected { background-color: #007ACC; color: #FFFFFF; }
        QToolTip { background-color: #4A4A4A; color: #F0F0F0; border: 1px solid #6A6A6A; padding: 4px; border-radius: 3px; }
        QSplitter::handle { background-color: #5A5A5A; }
        QSplitter::handle:horizontal { width: 5px; }
        QSplitter::handle:vertical { height: 5px; }
        QFrame[frameShape="4"], QFrame[frameShape="5"] { 
            border: 1px solid #4A4A4A; 
            border-radius: 3px;
        }
        """

    def browse_directory (self ):
        initial_dir_text =self .dir_input .text ()
        start_path =""
        if initial_dir_text and os .path .isdir (initial_dir_text ):
            start_path =initial_dir_text 
        else :
            home_location =QStandardPaths .writableLocation (QStandardPaths .HomeLocation )
            documents_location =QStandardPaths .writableLocation (QStandardPaths .DocumentsLocation )
            if home_location and os .path .isdir (home_location ):
                start_path =home_location 
            elif documents_location and os .path .isdir (documents_location ):
                start_path =documents_location 

        self .log_signal .emit (f"ℹ️ Opening folder dialog. Suggested start path: '{start_path }'")

        try :
            folder =QFileDialog .getExistingDirectory (
            self ,
            "Select Download Folder",
            start_path ,
            options =QFileDialog .DontUseNativeDialog |QFileDialog .ShowDirsOnly 
            )

            if folder :
                self .dir_input .setText (folder )
                self .log_signal .emit (f"ℹ️ Folder selected: {folder }")
            else :
                self .log_signal .emit (f"ℹ️ Folder selection cancelled by user.")
        except RuntimeError as e :
            self .log_signal .emit (f"❌ RuntimeError opening folder dialog: {e }. This might indicate a deeper Qt or system issue.")
            QMessageBox .critical (self ,"Dialog Error",f"A runtime error occurred while trying to open the folder dialog: {e }")
        except Exception as e :
            self .log_signal .emit (f"❌ Unexpected error opening folder dialog: {e }\n{traceback .format_exc (limit =3 )}")
            QMessageBox .critical (self ,"Dialog Error",f"An unexpected error occurred with the folder selection dialog: {e }")

    def handle_main_log (self ,message ):
        is_html_message =message .startswith (HTML_PREFIX )
        display_message =message 
        use_html =False 

        if is_html_message :
            display_message =message [len (HTML_PREFIX ):]
            use_html =True 

        try :
            safe_message =str (display_message ).replace ('\x00','[NULL]')
            if use_html :
                self .main_log_output .insertHtml (safe_message )
            else :
                self .main_log_output .append (safe_message )

            scrollbar =self .main_log_output .verticalScrollBar ()
            if scrollbar .value ()>=scrollbar .maximum ()-30 :
                scrollbar .setValue (scrollbar .maximum ())
        except Exception as e :
            print (f"GUI Main Log Error: {e }\nOriginal Message: {message }")
    def _extract_key_term_from_title (self ,title ):
        if not title :
            return None 
        title_cleaned =re .sub (r'\[.*?\]','',title )
        title_cleaned =re .sub (r'\(.*?\)','',title_cleaned )
        title_cleaned =title_cleaned .strip ()
        word_matches =list (re .finditer (r'\b[a-zA-Z][a-zA-Z0-9_-]*\b',title_cleaned ))

        capitalized_candidates =[]
        for match in word_matches :
            word =match .group (0 )
            if word .istitle ()and word .lower ()not in self .STOP_WORDS and len (word )>2 :
                if not (len (word )>3 and word .isupper ()):
                    capitalized_candidates .append ({'text':word ,'len':len (word ),'pos':match .start ()})

        if capitalized_candidates :
            capitalized_candidates .sort (key =lambda x :(x ['len'],x ['pos']),reverse =True )
            return capitalized_candidates [0 ]['text']
        non_capitalized_words_info =[]
        for match in word_matches :
            word =match .group (0 )
            if word .lower ()not in self .STOP_WORDS and len (word )>3 :
                non_capitalized_words_info .append ({'text':word ,'len':len (word ),'pos':match .start ()})

        if non_capitalized_words_info :
            non_capitalized_words_info .sort (key =lambda x :(x ['len'],x ['pos']),reverse =True )
            return non_capitalized_words_info [0 ]['text']

        return None 

    def handle_missed_character_post (self ,post_title ,reason ):
        if self .missed_character_log_output :
            key_term =self ._extract_key_term_from_title (post_title )

            if key_term :
                normalized_key_term =key_term .lower ()
                if normalized_key_term not in self .already_logged_bold_key_terms :
                    self .already_logged_bold_key_terms .add (normalized_key_term )
                    self .missed_key_terms_buffer .append (key_term )
                    self ._refresh_missed_character_log ()
        else :
            print (f"Debug (Missed Char Log): Title='{post_title }', Reason='{reason }'")

    def _refresh_missed_character_log (self ):
        if self .missed_character_log_output :
            self .missed_character_log_output .clear ()
            sorted_terms =sorted (self .missed_key_terms_buffer ,key =str .lower )
            separator_line ="-"*40 

            for term in sorted_terms :
                display_term =term .capitalize ()

                self .missed_character_log_output .append (separator_line )
                self .missed_character_log_output .append (f'<p align="center"><b><font style="font-size: 12.4pt; color: #87CEEB;">{display_term }</font></b></p>')
                self .missed_character_log_output .append (separator_line )
                self .missed_character_log_output .append ("")

            scrollbar =self .missed_character_log_output .verticalScrollBar ()
            scrollbar .setValue (0 )

    def _is_download_active (self ):
        single_thread_active =self .download_thread and self .download_thread .isRunning ()
        fetcher_active =hasattr (self ,'is_fetcher_thread_running')and self .is_fetcher_thread_running 
        pool_has_active_tasks =self .thread_pool is not None and any (not f .done ()for f in self .active_futures if f is not None )
        retry_pool_active =hasattr (self ,'retry_thread_pool')and self .retry_thread_pool is not None and hasattr (self ,'active_retry_futures')and any (not f .done ()for f in self .active_retry_futures if f is not None )


        external_dl_thread_active =hasattr (self ,'external_link_download_thread')and self .external_link_download_thread is not None and self .external_link_download_thread .isRunning ()

        return single_thread_active or fetcher_active or pool_has_active_tasks or retry_pool_active or external_dl_thread_active 

    def handle_external_link_signal (self ,post_title ,link_text ,link_url ,platform ,decryption_key ):
        link_data =(post_title ,link_text ,link_url ,platform ,decryption_key )
        self .external_link_queue .append (link_data )
        if self .radio_only_links and self .radio_only_links .isChecked ():
            self .extracted_links_cache .append (link_data )
            self ._update_download_extracted_links_button_state ()

        is_only_links_mode =self .radio_only_links and self .radio_only_links .isChecked ()
        should_display_in_external_log =self .show_external_links and not is_only_links_mode 

        if not (is_only_links_mode or should_display_in_external_log ):
            self ._is_processing_external_link_queue =False 
            if self .external_link_queue :
                QTimer .singleShot (0 ,self ._try_process_next_external_link )
            return 


        if link_data not in self .extracted_links_cache :
            self .extracted_links_cache .append (link_data )

    def _try_process_next_external_link (self ):
        if self ._is_processing_external_link_queue or not self .external_link_queue :
            return 

        is_only_links_mode =self .radio_only_links and self .radio_only_links .isChecked ()
        should_display_in_external_log =self .show_external_links and not is_only_links_mode 

        if not (is_only_links_mode or should_display_in_external_log ):
            self ._is_processing_external_link_queue =False 
            if self .external_link_queue :
                QTimer .singleShot (0 ,self ._try_process_next_external_link )
            return 

        self ._is_processing_external_link_queue =True 
        link_data =self .external_link_queue .popleft ()

        if is_only_links_mode :
            QTimer .singleShot (0 ,lambda data =link_data :self ._display_and_schedule_next (data ))
        elif self ._is_download_active ():
            delay_ms =random .randint (4000 ,8000 )
            QTimer .singleShot (delay_ms ,lambda data =link_data :self ._display_and_schedule_next (data ))
        else :
            QTimer .singleShot (0 ,lambda data =link_data :self ._display_and_schedule_next (data ))


    def _display_and_schedule_next (self ,link_data ):
        post_title ,link_text ,link_url ,platform ,decryption_key =link_data 
        is_only_links_mode =self .radio_only_links and self .radio_only_links .isChecked ()

        max_link_text_len =50 
        display_text =(link_text [:max_link_text_len ].strip ()+"..."
        if len (link_text )>max_link_text_len else link_text .strip ())
        formatted_link_info =f"{display_text } - {link_url } - {platform }"

        if decryption_key :
            formatted_link_info +=f" (Decryption Key: {decryption_key })"

        if is_only_links_mode :
            if post_title !=self ._current_link_post_title :
                separator_html ="<br>"+"-"*45 +"<br>"
                if self ._current_link_post_title is not None :
                    self .log_signal .emit (HTML_PREFIX +separator_html )
                title_html =f'<b style="color: #87CEEB;">{html .escape (post_title )}</b><br>'
                self .log_signal .emit (HTML_PREFIX +title_html )
                self ._current_link_post_title =post_title 

            self .log_signal .emit (formatted_link_info )
        elif self .show_external_links :
            separator ="-"*45 
            self ._append_to_external_log (formatted_link_info ,separator )

        self ._is_processing_external_link_queue =False 
        self ._try_process_next_external_link ()


    def _append_to_external_log (self ,formatted_link_text ,separator ):
        if not (self .external_log_output and self .external_log_output .isVisible ()):
            return 

        try :
            self .external_log_output .append (formatted_link_text )
            self .external_log_output .append ("")

            scrollbar =self .external_log_output .verticalScrollBar ()
            if scrollbar .value ()>=scrollbar .maximum ()-50 :
                scrollbar .setValue (scrollbar .maximum ())
        except Exception as e :
            self .log_signal .emit (f"GUI External Log Append Error: {e }\nOriginal Message: {formatted_link_text }")
            print (f"GUI External Log Error (Append): {e }\nOriginal Message: {formatted_link_text }")


    def update_file_progress_display (self ,filename ,progress_info ):
        if not filename and progress_info is None :
            self .file_progress_label .setText ("")
            return 

        if isinstance (progress_info ,list ):
            if not progress_info :
                self .file_progress_label .setText (self ._tr ("downloading_multipart_initializing_text","File: {filename} - Initializing parts...").format (filename =filename ))
                return 

            total_downloaded_overall =sum (cs .get ('downloaded',0 )for cs in progress_info )
            total_file_size_overall =sum (cs .get ('total',0 )for cs in progress_info )

            active_chunks_count =0 
            combined_speed_bps =0 
            for cs in progress_info :
                if cs .get ('active',False ):
                    active_chunks_count +=1 
                    combined_speed_bps +=cs .get ('speed_bps',0 )

            dl_mb =total_downloaded_overall /(1024 *1024 )
            total_mb =total_file_size_overall /(1024 *1024 )
            speed_MBps =(combined_speed_bps /8 )/(1024 *1024 )

            progress_text =self ._tr ("downloading_multipart_text","DL '{filename}...': {downloaded_mb:.1f}/{total_mb:.1f} MB ({parts} parts @ {speed:.2f} MB/s)").format (filename =filename [:20 ],downloaded_mb =dl_mb ,total_mb =total_mb ,parts =active_chunks_count ,speed =speed_MBps )
            self .file_progress_label .setText (progress_text )

        elif isinstance (progress_info ,tuple )and len (progress_info )==2 :
            downloaded_bytes ,total_bytes =progress_info 

            if not filename and total_bytes ==0 and downloaded_bytes ==0 :
                self .file_progress_label .setText ("")
                return 

            max_fn_len =25 
            disp_fn =filename if len (filename )<=max_fn_len else filename [:max_fn_len -3 ].strip ()+"..."

            dl_mb =downloaded_bytes /(1024 *1024 )
            if total_bytes >0 :
                tot_mb =total_bytes /(1024 *1024 )
                prog_text_base =self ._tr ("downloading_file_known_size_text","Downloading '{filename}' ({downloaded_mb:.1f}MB / {total_mb:.1f}MB)").format (filename =disp_fn ,downloaded_mb =dl_mb ,total_mb =tot_mb )
            else :
                prog_text_base =self ._tr ("downloading_file_unknown_size_text","Downloading '{filename}' ({downloaded_mb:.1f}MB)").format (filename =disp_fn ,downloaded_mb =dl_mb )

            self .file_progress_label .setText (prog_text_base )
        elif filename and progress_info is None :
            self .file_progress_label .setText ("")
        elif not filename and not progress_info :
            self .file_progress_label .setText ("")


    def update_external_links_setting (self ,checked ):
        is_only_links_mode =self .radio_only_links and self .radio_only_links .isChecked ()
        is_only_archives_mode =self .radio_only_archives and self .radio_only_archives .isChecked ()

        if is_only_links_mode or is_only_archives_mode :
            if self .external_log_output :self .external_log_output .hide ()
            if self .log_splitter :self .log_splitter .setSizes ([self .height (),0 ])
            return 

        self .show_external_links =checked 
        if checked :
            if self .external_log_output :self .external_log_output .show ()
            if self .log_splitter :self .log_splitter .setSizes ([self .height ()//2 ,self .height ()//2 ])
            if self .main_log_output :self .main_log_output .setMinimumHeight (50 )
            if self .external_log_output :self .external_log_output .setMinimumHeight (50 )
            self .log_signal .emit ("\n"+"="*40 +"\n🔗 External Links Log Enabled\n"+"="*40 )
            if self .external_log_output :
                self .external_log_output .clear ()
                self .external_log_output .append ("🔗 External Links Found:")
            self ._try_process_next_external_link ()
        else :
            if self .external_log_output :self .external_log_output .hide ()
            if self .log_splitter :self .log_splitter .setSizes ([self .height (),0 ])
            if self .main_log_output :self .main_log_output .setMinimumHeight (0 )
            if self .external_log_output :self .external_log_output .setMinimumHeight (0 )
            if self .external_log_output :self .external_log_output .clear ()
            self .log_signal .emit ("\n"+"="*40 +"\n🔗 External Links Log Disabled\n"+"="*40 )


    def _handle_filter_mode_change (self ,button ,checked ):
        if not button or not checked :
            return 


        is_only_links =(button ==self .radio_only_links )
        is_only_audio =(hasattr (self ,'radio_only_audio')and self .radio_only_audio is not None and button ==self .radio_only_audio )
        is_only_archives =(hasattr (self ,'radio_only_archives')and self .radio_only_archives is not None and button ==self .radio_only_archives )

        if self .skip_scope_toggle_button :
            self .skip_scope_toggle_button .setVisible (not (is_only_links or is_only_archives or is_only_audio ))
        if hasattr (self ,'multipart_toggle_button')and self .multipart_toggle_button :
            self .multipart_toggle_button .setVisible (not (is_only_links or is_only_archives or is_only_audio ))

        if self .link_search_input :self .link_search_input .setVisible (is_only_links )
        if self .link_search_button :self .link_search_button .setVisible (is_only_links )
        if self .export_links_button :
            self .export_links_button .setVisible (is_only_links )
            self .export_links_button .setEnabled (is_only_links and bool (self .extracted_links_cache ))

        if hasattr (self ,'download_extracted_links_button')and self .download_extracted_links_button :
            self .download_extracted_links_button .setVisible (is_only_links )
            self ._update_download_extracted_links_button_state ()

        if self .download_btn :
            if is_only_links :
                self .download_btn .setText (self ._tr ("extract_links_button_text","🔗 Extract Links"))
            else :
                self .download_btn .setText (self ._tr ("start_download_button_text","⬇️ Start Download"))
        if not is_only_links and self .link_search_input :self .link_search_input .clear ()

        file_download_mode_active =not is_only_links 



        if self .use_subfolders_checkbox :self .use_subfolders_checkbox .setEnabled (file_download_mode_active )
        if self .skip_words_input :self .skip_words_input .setEnabled (file_download_mode_active )
        if self .skip_scope_toggle_button :self .skip_scope_toggle_button .setEnabled (file_download_mode_active )
        if hasattr (self ,'remove_from_filename_input'):self .remove_from_filename_input .setEnabled (file_download_mode_active )

        if self .skip_zip_checkbox :
            can_skip_zip =file_download_mode_active and not is_only_archives 
            self .skip_zip_checkbox .setEnabled (can_skip_zip )
            if is_only_archives :
                self .skip_zip_checkbox .setChecked (False )

        if self .skip_rar_checkbox :
            can_skip_rar =file_download_mode_active and not is_only_archives 
            self .skip_rar_checkbox .setEnabled (can_skip_rar )
            if is_only_archives :
                self .skip_rar_checkbox .setChecked (False )

        other_file_proc_enabled =file_download_mode_active and not is_only_archives 
        if self .download_thumbnails_checkbox :self .download_thumbnails_checkbox .setEnabled (other_file_proc_enabled )
        if self .compress_images_checkbox :self .compress_images_checkbox .setEnabled (other_file_proc_enabled )

        if self .external_links_checkbox :
            can_show_external_log_option =file_download_mode_active and not is_only_archives 
            self .external_links_checkbox .setEnabled (can_show_external_log_option )
            if not can_show_external_log_option :
                self .external_links_checkbox .setChecked (False )


        if is_only_links :
            self .progress_log_label .setText ("📜 Extracted Links Log:")
            if self .external_log_output :self .external_log_output .hide ()
            if self .log_splitter :self .log_splitter .setSizes ([self .height (),0 ])


            do_clear_log_in_filter_change =True 
            if self .mega_download_log_preserved_once and self .only_links_log_display_mode ==LOG_DISPLAY_DOWNLOAD_PROGRESS :
                do_clear_log_in_filter_change =False 

            if self .main_log_output and do_clear_log_in_filter_change :
                self .log_signal .emit ("INTERNAL: _handle_filter_mode_change - About to clear log.")
                self .main_log_output .clear ()
                self .log_signal .emit ("INTERNAL: _handle_filter_mode_change - Log cleared by _handle_filter_mode_change.")

            if self .main_log_output :self .main_log_output .setMinimumHeight (0 )
            self .log_signal .emit ("="*20 +" Mode changed to: Only Links "+"="*20 )
            self ._try_process_next_external_link ()
        elif is_only_archives :
            self .progress_log_label .setText ("📜 Progress Log (Archives Only):")
            if self .external_log_output :self .external_log_output .hide ()
            if self .log_splitter :self .log_splitter .setSizes ([self .height (),0 ])
            if self .main_log_output :self .main_log_output .clear ()
            self .log_signal .emit ("="*20 +" Mode changed to: Only Archives "+"="*20 )
        elif is_only_audio :
            self .progress_log_label .setText (self ._tr ("progress_log_label_text","📜 Progress Log:")+f" ({self ._tr ('filter_audio_radio','🎧 Only Audio')})")
            if self .external_log_output :self .external_log_output .hide ()
            if self .log_splitter :self .log_splitter .setSizes ([self .height (),0 ])
            if self .main_log_output :self .main_log_output .clear ()
            self .log_signal .emit ("="*20 +f" Mode changed to: {self ._tr ('filter_audio_radio','🎧 Only Audio')} "+"="*20 )
        else :
            self .progress_log_label .setText (self ._tr ("progress_log_label_text","📜 Progress Log:"))
            self .update_external_links_setting (self .external_links_checkbox .isChecked ()if self .external_links_checkbox else False )
            self .log_signal .emit (f"="*20 +f" Mode changed to: {button .text ()} "+"="*20 )


        if is_only_links :
            self ._filter_links_log ()

        if hasattr (self ,'log_display_mode_toggle_button'):
            self .log_display_mode_toggle_button .setVisible (is_only_links )
            self ._update_log_display_mode_button_text ()

        subfolders_on =self .use_subfolders_checkbox .isChecked ()if self .use_subfolders_checkbox else False 
        manga_on =self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False 

        character_filter_should_be_active =file_download_mode_active and not is_only_archives 

        if self .character_filter_widget :
            self .character_filter_widget .setVisible (character_filter_should_be_active )

        enable_character_filter_related_widgets =character_filter_should_be_active 

        if self .character_input :
            self .character_input .setEnabled (enable_character_filter_related_widgets )
            if not enable_character_filter_related_widgets :
                self .character_input .clear ()

        if self .char_filter_scope_toggle_button :
            self .char_filter_scope_toggle_button .setEnabled (enable_character_filter_related_widgets )

        self .update_ui_for_subfolders (subfolders_on )
        self .update_custom_folder_visibility ()
        self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False )


    def _filter_links_log (self ):
        if not (self .radio_only_links and self .radio_only_links .isChecked ()):return 

        search_term =self .link_search_input .text ().lower ().strip ()if self .link_search_input else ""

        if self .mega_download_log_preserved_once and self .only_links_log_display_mode ==LOG_DISPLAY_DOWNLOAD_PROGRESS :


            self .log_signal .emit ("INTERNAL: _filter_links_log - Preserving Mega log (due to mega_download_log_preserved_once).")
        elif self .only_links_log_display_mode ==LOG_DISPLAY_DOWNLOAD_PROGRESS :



            self .log_signal .emit ("INTERNAL: _filter_links_log - In Progress View. Clearing for placeholder.")
            if self .main_log_output :self .main_log_output .clear ()
            self .log_signal .emit ("INTERNAL: _filter_links_log - Cleared for progress placeholder.")
            self .log_signal .emit ("ℹ️ Switched to Mega download progress view. Extracted links are hidden.\n"
            "   Perform a Mega download to see its progress here, or switch back to 🔗 view.")
            self .log_signal .emit ("INTERNAL: _filter_links_log - Placeholder message emitted.")

        else :

            self .log_signal .emit ("INTERNAL: _filter_links_log - In links view branch. About to clear.")
            if self .main_log_output :self .main_log_output .clear ()
            self .log_signal .emit ("INTERNAL: _filter_links_log - Cleared for links view.")

            current_title_for_display =None 
            any_links_displayed_this_call =False 
            separator_html ="<br>"+"-"*45 +"<br>"

            for post_title ,link_text ,link_url ,platform ,decryption_key in self .extracted_links_cache :
                matches_search =(not search_term or 
                search_term in link_text .lower ()or 
                search_term in link_url .lower ()or 
                search_term in platform .lower ()or 
                (decryption_key and search_term in decryption_key .lower ()))
                if not matches_search :
                    continue 

                any_links_displayed_this_call =True 
                if post_title !=current_title_for_display :
                    if current_title_for_display is not None :
                        if self .main_log_output :self .main_log_output .insertHtml (separator_html )

                    title_html =f'<b style="color: #87CEEB;">{html .escape (post_title )}</b><br>'
                    if self .main_log_output :self .main_log_output .insertHtml (title_html )
                    current_title_for_display =post_title 

                max_link_text_len =50 
                display_text =(link_text [:max_link_text_len ].strip ()+"..."if len (link_text )>max_link_text_len else link_text .strip ())

                plain_link_info_line =f"{display_text } - {link_url } - {platform }"
                if decryption_key :
                    plain_link_info_line +=f" (Decryption Key: {decryption_key })"
                if self .main_log_output :
                    self .main_log_output .append (plain_link_info_line )

            if any_links_displayed_this_call :
                if self .main_log_output :self .main_log_output .append ("")
            elif not search_term and self .main_log_output :
                 self .log_signal .emit ("   (No links extracted yet or all filtered out in links view)")


        if self .main_log_output :self .main_log_output .verticalScrollBar ().setValue (self .main_log_output .verticalScrollBar ().maximum ())


    def _export_links_to_file (self ):
        if not (self .radio_only_links and self .radio_only_links .isChecked ()):
            QMessageBox .information (self ,"Export Links","Link export is only available in 'Only Links' mode.")
            return 
        if not self .extracted_links_cache :
            QMessageBox .information (self ,"Export Links","No links have been extracted yet.")
            return 

        default_filename ="extracted_links.txt"
        filepath ,_ =QFileDialog .getSaveFileName (self ,"Save Links",default_filename ,"Text Files (*.txt);;All Files (*)")

        if filepath :
            try :
                with open (filepath ,'w',encoding ='utf-8')as f :
                    current_title_for_export =None 
                    separator ="-"*60 +"\n"
                    for post_title ,link_text ,link_url ,platform ,decryption_key in self .extracted_links_cache :
                        if post_title !=current_title_for_export :
                            if current_title_for_export is not None :
                                f .write ("\n"+separator +"\n")
                            f .write (f"Post Title: {post_title }\n\n")
                            current_title_for_export =post_title 
                        line_to_write =f"  {link_text } - {link_url } - {platform }"
                        if decryption_key :
                            line_to_write +=f" (Decryption Key: {decryption_key })"
                        f .write (line_to_write +"\n")
                self .log_signal .emit (f"✅ Links successfully exported to: {filepath }")
                QMessageBox .information (self ,"Export Successful",f"Links exported to:\n{filepath }")
            except Exception as e :
                self .log_signal .emit (f"❌ Error exporting links: {e }")
                QMessageBox .critical (self ,"Export Error",f"Could not export links: {e }")


    def get_filter_mode (self ):
        if self .radio_only_links and self .radio_only_links .isChecked ():
            return 'all'
        elif self .radio_images .isChecked ():
            return 'image'
        elif self .radio_videos .isChecked ():
            return 'video'
        elif self .radio_only_archives and self .radio_only_archives .isChecked ():
            return 'archive'
        elif hasattr (self ,'radio_only_audio')and self .radio_only_audio .isChecked ():
            return 'audio'
        elif self .radio_all .isChecked ():
            return 'all'
        return 'all'


    def get_skip_words_scope (self ):
        return self .skip_words_scope 


    def _update_skip_scope_button_text (self ):
        if self .skip_scope_toggle_button :
            if self .skip_words_scope ==SKIP_SCOPE_FILES :
                self .skip_scope_toggle_button .setText (self ._tr ("skip_scope_files_text","Scope: Files"))
                self .skip_scope_toggle_button .setToolTip (self ._tr ("skip_scope_files_tooltip","Tooltip for skip scope files"))
            elif self .skip_words_scope ==SKIP_SCOPE_POSTS :
                self .skip_scope_toggle_button .setText (self ._tr ("skip_scope_posts_text","Scope: Posts"))
                self .skip_scope_toggle_button .setToolTip (self ._tr ("skip_scope_posts_tooltip","Tooltip for skip scope posts"))
            elif self .skip_words_scope ==SKIP_SCOPE_BOTH :
                self .skip_scope_toggle_button .setText (self ._tr ("skip_scope_both_text","Scope: Both"))
                self .skip_scope_toggle_button .setToolTip (self ._tr ("skip_scope_both_tooltip","Tooltip for skip scope both"))
            else :
                self .skip_scope_toggle_button .setText (self ._tr ("skip_scope_unknown_text","Scope: Unknown"))
                self .skip_scope_toggle_button .setToolTip (self ._tr ("skip_scope_unknown_tooltip","Tooltip for skip scope unknown"))


    def _cycle_skip_scope (self ):
        if self .skip_words_scope ==SKIP_SCOPE_POSTS :
            self .skip_words_scope =SKIP_SCOPE_FILES 
        elif self .skip_words_scope ==SKIP_SCOPE_FILES :
            self .skip_words_scope =SKIP_SCOPE_BOTH 
        elif self .skip_words_scope ==SKIP_SCOPE_BOTH :
            self .skip_words_scope =SKIP_SCOPE_POSTS 
        else :
            self .skip_words_scope =SKIP_SCOPE_POSTS 

        self ._update_skip_scope_button_text ()
        self .settings .setValue (SKIP_WORDS_SCOPE_KEY ,self .skip_words_scope )
        self .log_signal .emit (f"ℹ️ Skip words scope changed to: '{self .skip_words_scope }'")

    def get_char_filter_scope (self ):
        return self .char_filter_scope 

    def _update_char_filter_scope_button_text (self ):
        if self .char_filter_scope_toggle_button :
            if self .char_filter_scope ==CHAR_SCOPE_FILES :
                self .char_filter_scope_toggle_button .setText (self ._tr ("char_filter_scope_files_text","Filter: Files"))
                self .char_filter_scope_toggle_button .setToolTip (self ._tr ("char_filter_scope_files_tooltip","Tooltip for char filter files"))
            elif self .char_filter_scope ==CHAR_SCOPE_TITLE :
                self .char_filter_scope_toggle_button .setText (self ._tr ("char_filter_scope_title_text","Filter: Title"))
                self .char_filter_scope_toggle_button .setToolTip (self ._tr ("char_filter_scope_title_tooltip","Tooltip for char filter title"))
            elif self .char_filter_scope ==CHAR_SCOPE_BOTH :
                self .char_filter_scope_toggle_button .setText (self ._tr ("char_filter_scope_both_text","Filter: Both"))
                self .char_filter_scope_toggle_button .setToolTip (self ._tr ("char_filter_scope_both_tooltip","Tooltip for char filter both"))
            elif self .char_filter_scope ==CHAR_SCOPE_COMMENTS :
                self .char_filter_scope_toggle_button .setText (self ._tr ("char_filter_scope_comments_text","Filter: Comments (Beta)"))
                self .char_filter_scope_toggle_button .setToolTip (self ._tr ("char_filter_scope_comments_tooltip","Tooltip for char filter comments"))
            else :
                self .char_filter_scope_toggle_button .setText (self ._tr ("char_filter_scope_unknown_text","Filter: Unknown"))
                self .char_filter_scope_toggle_button .setToolTip (self ._tr ("char_filter_scope_unknown_tooltip","Tooltip for char filter unknown"))

    def _cycle_char_filter_scope (self ):
        if self .char_filter_scope ==CHAR_SCOPE_TITLE :
            self .char_filter_scope =CHAR_SCOPE_FILES 
        elif self .char_filter_scope ==CHAR_SCOPE_FILES :
            self .char_filter_scope =CHAR_SCOPE_BOTH 
        elif self .char_filter_scope ==CHAR_SCOPE_BOTH :
            self .char_filter_scope =CHAR_SCOPE_COMMENTS 
        elif self .char_filter_scope ==CHAR_SCOPE_COMMENTS :
            self .char_filter_scope =CHAR_SCOPE_TITLE 
        else :
            self .char_filter_scope =CHAR_SCOPE_TITLE 

        self ._update_char_filter_scope_button_text ()
        self .settings .setValue (CHAR_FILTER_SCOPE_KEY ,self .char_filter_scope )
        self .log_signal .emit (f"ℹ️ Character filter scope changed to: '{self .char_filter_scope }'")

    def _handle_ui_add_new_character (self ):
        """Handles adding a new character from the UI input field."""
        name_from_ui_input =self .new_char_input .text ().strip ()
        successfully_added_any =False 

        if not name_from_ui_input :
            QMessageBox .warning (self ,"Input Error","Name cannot be empty.")
            return 

        if name_from_ui_input .startswith ("(")and name_from_ui_input .endswith (")~"):
            content =name_from_ui_input [1 :-2 ].strip ()
            aliases =[alias .strip ()for alias in content .split (',')if alias .strip ()]
            if aliases :
                folder_name =" ".join (aliases )
                if self .add_new_character (name_to_add =folder_name ,
                is_group_to_add =True ,
                aliases_to_add =aliases ,
                suppress_similarity_prompt =False ):
                    successfully_added_any =True 
            else :
                QMessageBox .warning (self ,"Input Error","Empty group content for `~` format.")

        elif name_from_ui_input .startswith ("(")and name_from_ui_input .endswith (")"):
            content =name_from_ui_input [1 :-1 ].strip ()
            names_to_add_separately =[name .strip ()for name in content .split (',')if name .strip ()]
            if names_to_add_separately :
                for name_item in names_to_add_separately :
                    if self .add_new_character (name_to_add =name_item ,
                    is_group_to_add =False ,
                    aliases_to_add =[name_item ],
                    suppress_similarity_prompt =False ):
                        successfully_added_any =True 
            else :
                QMessageBox .warning (self ,"Input Error","Empty group content for standard group format.")
        else :
            if self .add_new_character (name_to_add =name_from_ui_input ,
            is_group_to_add =False ,
            aliases_to_add =[name_from_ui_input ],
            suppress_similarity_prompt =False ):
                successfully_added_any =True 

        if successfully_added_any :
            self .new_char_input .clear ()
            self .save_known_names ()


    def add_new_character (self ,name_to_add ,is_group_to_add ,aliases_to_add ,suppress_similarity_prompt =False ):
        global KNOWN_NAMES ,clean_folder_name 
        if not name_to_add :
            QMessageBox .warning (self ,"Input Error","Name cannot be empty.");return False 

        name_to_add_lower =name_to_add .lower ()
        for kn_entry in KNOWN_NAMES :
            if kn_entry ["name"].lower ()==name_to_add_lower :
                QMessageBox .warning (self ,"Duplicate Name",f"The primary folder name '{name_to_add }' already exists.");return False 
            if not is_group_to_add and name_to_add_lower in [a .lower ()for a in kn_entry ["aliases"]]:
                QMessageBox .warning (self ,"Duplicate Alias",f"The name '{name_to_add }' already exists as an alias for '{kn_entry ['name']}'.");return False 

        similar_names_details =[]
        for kn_entry in KNOWN_NAMES :
            for term_to_check_similarity_against in kn_entry ["aliases"]:
                term_lower =term_to_check_similarity_against .lower ()
                if name_to_add_lower !=term_lower and (name_to_add_lower in term_lower or term_lower in name_to_add_lower ):
                    similar_names_details .append ((name_to_add ,kn_entry ["name"]))
                    break 
            for new_alias in aliases_to_add :
                if new_alias .lower ()!=term_to_check_similarity_against .lower ()and (new_alias .lower ()in term_to_check_similarity_against .lower ()or term_to_check_similarity_against .lower ()in new_alias .lower ()):
                    similar_names_details .append ((new_alias ,kn_entry ["name"]))
                    break 

        if similar_names_details and not suppress_similarity_prompt :
            if similar_names_details :
                first_similar_new ,first_similar_existing =similar_names_details [0 ]
                shorter ,longer =sorted ([first_similar_new ,first_similar_existing ],key =len )

                msg_box =QMessageBox (self )
                msg_box .setIcon (QMessageBox .Warning )
                msg_box .setWindowTitle ("Potential Name Conflict")
                msg_box .setText (
                f"The name '{first_similar_new }' is very similar to an existing name: '{first_similar_existing }'.\n\n"
                f"This could lead to unexpected folder grouping (e.g., under '{clean_folder_name (shorter )}' instead of a more specific '{clean_folder_name (longer )}' or vice-versa).\n\n"
                "Do you want to change the name you are adding, or proceed anyway?"
                )
                change_button =msg_box .addButton ("Change Name",QMessageBox .RejectRole )
                proceed_button =msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
                msg_box .setDefaultButton (proceed_button )
                msg_box .setEscapeButton (change_button )
                msg_box .exec_ ()

                if msg_box .clickedButton ()==change_button :
                    self .log_signal .emit (f"ℹ️ User chose to change '{first_similar_new }' due to similarity with an alias of '{first_similar_existing }'.")
                    return False 
                self .log_signal .emit (f"⚠️ User proceeded with adding '{first_similar_new }' despite similarity with an alias of '{first_similar_existing }'.")
        new_entry ={
        "name":name_to_add ,
        "is_group":is_group_to_add ,
        "aliases":sorted (list (set (aliases_to_add )),key =str .lower )
        }
        if is_group_to_add :
            for new_alias in new_entry ["aliases"]:
                if any (new_alias .lower ()==kn_entry ["name"].lower ()for kn_entry in KNOWN_NAMES if kn_entry ["name"].lower ()!=name_to_add_lower ):
                    QMessageBox .warning (self ,"Alias Conflict",f"Alias '{new_alias }' (for group '{name_to_add }') conflicts with an existing primary name.");return False 
        KNOWN_NAMES .append (new_entry )
        KNOWN_NAMES .sort (key =lambda x :x ["name"].lower ())

        self .character_list .clear ()
        self .character_list .addItems ([entry ["name"]for entry in KNOWN_NAMES ])
        self .filter_character_list (self .character_search_input .text ())

        log_msg_suffix =f" (as group with aliases: {', '.join (new_entry ['aliases'])})"if is_group_to_add and len (new_entry ['aliases'])>1 else ""
        self .log_signal .emit (f"✅ Added '{name_to_add }' to known names list{log_msg_suffix }.")
        self .new_char_input .clear ()
        return True 


    def delete_selected_character (self ):
        global KNOWN_NAMES 
        selected_items =self .character_list .selectedItems ()
        if not selected_items :
            QMessageBox .warning (self ,"Selection Error","Please select one or more names to delete.");return 

        primary_names_to_remove ={item .text ()for item in selected_items }
        confirm =QMessageBox .question (self ,"Confirm Deletion",
        f"Are you sure you want to delete {len (primary_names_to_remove )} selected entry/entries (and their aliases)?",
        QMessageBox .Yes |QMessageBox .No ,QMessageBox .No )
        if confirm ==QMessageBox .Yes :
            original_count =len (KNOWN_NAMES )
            KNOWN_NAMES [:]=[entry for entry in KNOWN_NAMES if entry ["name"]not in primary_names_to_remove ]
            removed_count =original_count -len (KNOWN_NAMES )

            if removed_count >0 :
                self .log_signal .emit (f"🗑️ Removed {removed_count } name(s).")
                self .character_list .clear ()
                self .character_list .addItems ([entry ["name"]for entry in KNOWN_NAMES ])
                self .filter_character_list (self .character_search_input .text ())
                self .save_known_names ()
            else :
                self .log_signal .emit ("ℹ️ No names were removed (they might not have been in the list).")


    def update_custom_folder_visibility (self ,url_text =None ):
        if url_text is None :
            url_text =self .link_input .text ()

        _ ,_ ,post_id =extract_post_info (url_text .strip ())

        is_single_post_url =bool (post_id )
        subfolders_enabled =self .use_subfolders_checkbox .isChecked ()if self .use_subfolders_checkbox else False 

        not_only_links_or_archives_mode =not (
        (self .radio_only_links and self .radio_only_links .isChecked ())or 
        (self .radio_only_archives and self .radio_only_archives .isChecked ())or 
        (hasattr (self ,'radio_only_audio')and self .radio_only_audio .isChecked ())
        )

        should_show_custom_folder =is_single_post_url and subfolders_enabled and not_only_links_or_archives_mode 

        if self .custom_folder_widget :
            self .custom_folder_widget .setVisible (should_show_custom_folder )

        if not (self .custom_folder_widget and self .custom_folder_widget .isVisible ()):
            if self .custom_folder_input :self .custom_folder_input .clear ()


    def update_ui_for_subfolders (self ,separate_folders_by_name_title_checked :bool ):
        is_only_links =self .radio_only_links and self .radio_only_links .isChecked ()
        is_only_archives =self .radio_only_archives and self .radio_only_archives .isChecked ()
        is_only_audio =hasattr (self ,'radio_only_audio')and self .radio_only_audio .isChecked ()

        can_enable_subfolder_per_post_checkbox =not is_only_links 

        if self .use_subfolder_per_post_checkbox :
            self .use_subfolder_per_post_checkbox .setEnabled (can_enable_subfolder_per_post_checkbox )

            if not can_enable_subfolder_per_post_checkbox :
                self .use_subfolder_per_post_checkbox .setChecked (False )

        self .update_custom_folder_visibility ()


    def _update_cookie_input_visibility (self ,checked ):
        cookie_text_input_exists =hasattr (self ,'cookie_text_input')
        cookie_browse_button_exists =hasattr (self ,'cookie_browse_button')

        if cookie_text_input_exists or cookie_browse_button_exists :
            is_only_links =self .radio_only_links and self .radio_only_links .isChecked ()
            if cookie_text_input_exists :self .cookie_text_input .setVisible (checked )
            if cookie_browse_button_exists :self .cookie_browse_button .setVisible (checked )

            can_enable_cookie_text =checked and not is_only_links 
            enable_state_for_fields =can_enable_cookie_text and (self .download_btn .isEnabled ()or self .is_paused )

            if cookie_text_input_exists :
                self .cookie_text_input .setEnabled (enable_state_for_fields )
                if self .selected_cookie_filepath and checked :
                    self .cookie_text_input .setText (self .selected_cookie_filepath )
                    self .cookie_text_input .setReadOnly (True )
                    self .cookie_text_input .setPlaceholderText ("")
                elif checked :
                    self .cookie_text_input .setReadOnly (False )
                    self .cookie_text_input .setPlaceholderText ("Cookie string (if no cookies.txt)")

            if cookie_browse_button_exists :self .cookie_browse_button .setEnabled (enable_state_for_fields )

            if not checked :
                self .selected_cookie_filepath =None 


    def update_page_range_enabled_state (self ):
        url_text =self .link_input .text ().strip ()if self .link_input else ""
        _ ,_ ,post_id =extract_post_info (url_text )

        is_creator_feed =not post_id if url_text else False 
        enable_page_range =is_creator_feed 

        for widget in [self .page_range_label ,self .start_page_input ,self .to_label ,self .end_page_input ]:
            if widget :widget .setEnabled (enable_page_range )

        if not enable_page_range :
            if self .start_page_input :self .start_page_input .clear ()
            if self .end_page_input :self .end_page_input .clear ()


    def _update_manga_filename_style_button_text (self ):
        if self .manga_rename_toggle_button :
            if self .manga_filename_style ==STYLE_POST_TITLE :
                self .manga_rename_toggle_button .setText (self ._tr ("manga_style_post_title_text","Name: Post Title"))

            elif self .manga_filename_style ==STYLE_ORIGINAL_NAME :
                self .manga_rename_toggle_button .setText (self ._tr ("manga_style_original_file_text","Name: Original File"))

            elif self .manga_filename_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING :
                self .manga_rename_toggle_button .setText (self ._tr ("manga_style_title_global_num_text","Name: Title+G.Num"))

            elif self .manga_filename_style ==STYLE_DATE_BASED :
                self .manga_rename_toggle_button .setText (self ._tr ("manga_style_date_based_text","Name: Date Based"))


            elif self .manga_filename_style ==STYLE_DATE_POST_TITLE :
                self .manga_rename_toggle_button .setText (self ._tr ("manga_style_date_post_title_text","Name: Date + Title"))

            else :
                self .manga_rename_toggle_button .setText (self ._tr ("manga_style_unknown_text","Name: Unknown Style"))


            self .manga_rename_toggle_button .setToolTip ("Click to cycle Manga Filename Style (when Manga Mode is active for a creator feed).")


    def _toggle_manga_filename_style (self ):
        current_style =self .manga_filename_style 
        new_style =""
        if current_style ==STYLE_POST_TITLE :
            new_style =STYLE_ORIGINAL_NAME 
        elif current_style ==STYLE_ORIGINAL_NAME :
            new_style =STYLE_DATE_POST_TITLE 
        elif current_style ==STYLE_DATE_POST_TITLE :
            new_style =STYLE_POST_TITLE_GLOBAL_NUMBERING 
        elif current_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING :
            new_style =STYLE_DATE_BASED 
        elif current_style ==STYLE_DATE_BASED :
            new_style =STYLE_POST_TITLE 
        else :
            self .log_signal .emit (f"⚠️ Unknown current manga filename style: {current_style }. Resetting to default ('{STYLE_POST_TITLE }').")
            new_style =STYLE_POST_TITLE 

        self .manga_filename_style =new_style 
        self .settings .setValue (MANGA_FILENAME_STYLE_KEY ,self .manga_filename_style )
        self .settings .sync ()
        self ._update_manga_filename_style_button_text ()
        self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False )
        self .log_signal .emit (f"ℹ️ Manga filename style changed to: '{self .manga_filename_style }'")

    def _handle_favorite_mode_toggle (self ,checked ):
        if not self .url_or_placeholder_stack or not self .bottom_action_buttons_stack :
            return 

        self .url_or_placeholder_stack .setCurrentIndex (1 if checked else 0 )
        self .bottom_action_buttons_stack .setCurrentIndex (1 if checked else 0 )

        if checked :
            if self .link_input :
                self .link_input .clear ()
                self .link_input .setEnabled (False )
            for widget in [self .page_range_label ,self .start_page_input ,self .to_label ,self .end_page_input ]:
                if widget :widget .setEnabled (False )
            if self .start_page_input :self .start_page_input .clear ()
            if self .end_page_input :self .end_page_input .clear ()

            self .update_custom_folder_visibility ()
            self .update_page_range_enabled_state ()
            if self .manga_mode_checkbox :
                self .manga_mode_checkbox .setChecked (False )
                self .manga_mode_checkbox .setEnabled (False )
            if hasattr (self ,'use_cookie_checkbox'):
                self .use_cookie_checkbox .setChecked (True )
                self .use_cookie_checkbox .setEnabled (False )
            if hasattr (self ,'use_cookie_checkbox'):
                self ._update_cookie_input_visibility (True )
            self .update_ui_for_manga_mode (False )

            if hasattr (self ,'favorite_mode_artists_button'):
                self .favorite_mode_artists_button .setEnabled (True )
            if hasattr (self ,'favorite_mode_posts_button'):
                self .favorite_mode_posts_button .setEnabled (True )

        else :
            if self .link_input :self .link_input .setEnabled (True )
            self .update_page_range_enabled_state ()
            self .update_custom_folder_visibility ()
            self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False )

            if hasattr (self ,'use_cookie_checkbox'):
                self .use_cookie_checkbox .setEnabled (True )
            if hasattr (self ,'use_cookie_checkbox'):
                self ._update_cookie_input_visibility (self .use_cookie_checkbox .isChecked ())

            if hasattr (self ,'favorite_mode_artists_button'):
                self .favorite_mode_artists_button .setEnabled (False )
            if hasattr (self ,'favorite_mode_posts_button'):
                self .favorite_mode_posts_button .setEnabled (False )

    def update_ui_for_manga_mode (self ,checked ):
        is_only_links_mode =self .radio_only_links and self .radio_only_links .isChecked ()
        is_only_archives_mode =self .radio_only_archives and self .radio_only_archives .isChecked ()
        is_only_audio_mode =hasattr (self ,'radio_only_audio')and self .radio_only_audio .isChecked ()

        url_text =self .link_input .text ().strip ()if self .link_input else ""
        _ ,_ ,post_id =extract_post_info (url_text )

        is_creator_feed =not post_id if url_text else False 
        is_favorite_mode_on =self .favorite_mode_checkbox .isChecked ()if self .favorite_mode_checkbox else False 

        if self .manga_mode_checkbox :
            self .manga_mode_checkbox .setEnabled (is_creator_feed and not is_favorite_mode_on )
            if not is_creator_feed and self .manga_mode_checkbox .isChecked ():
                self .manga_mode_checkbox .setChecked (False )
                checked =self .manga_mode_checkbox .isChecked ()

        manga_mode_effectively_on =is_creator_feed and checked 

        if self .manga_rename_toggle_button :
            self .manga_rename_toggle_button .setVisible (manga_mode_effectively_on and not (is_only_links_mode or is_only_archives_mode or is_only_audio_mode ))

        self .update_page_range_enabled_state ()

        current_filename_style =self .manga_filename_style 

        enable_char_filter_widgets =not is_only_links_mode and not is_only_archives_mode 

        if self .character_input :
            self .character_input .setEnabled (enable_char_filter_widgets )
            if not enable_char_filter_widgets :self .character_input .clear ()
        if self .char_filter_scope_toggle_button :
            self .char_filter_scope_toggle_button .setEnabled (enable_char_filter_widgets )
        if self .character_filter_widget :
            self .character_filter_widget .setVisible (enable_char_filter_widgets )

        show_date_prefix_input =(
        manga_mode_effectively_on and 
        (current_filename_style ==STYLE_DATE_BASED or 
        current_filename_style ==STYLE_ORIGINAL_NAME )and 
        not (is_only_links_mode or is_only_archives_mode or is_only_audio_mode )
        )
        if hasattr (self ,'manga_date_prefix_input'):
            self .manga_date_prefix_input .setVisible (show_date_prefix_input )
            if show_date_prefix_input :
                self .manga_date_prefix_input .setMaximumWidth (120 )
                self .manga_date_prefix_input .setMinimumWidth (60 )
            else :
                self .manga_date_prefix_input .clear ()
                self .manga_date_prefix_input .setMaximumWidth (16777215 )
                self .manga_date_prefix_input .setMinimumWidth (0 )

        if hasattr (self ,'multipart_toggle_button'):

            hide_multipart_button_due_mode =is_only_links_mode or is_only_archives_mode or is_only_audio_mode 
            hide_multipart_button_due_manga_mode =manga_mode_effectively_on 
            self .multipart_toggle_button .setVisible (not (hide_multipart_button_due_mode or hide_multipart_button_due_manga_mode ))

        self ._update_multithreading_for_date_mode ()


    def filter_character_list (self ,search_text ):
        search_text_lower =search_text .lower ()
        for i in range (self .character_list .count ()):
            item =self .character_list .item (i )
            item .setHidden (search_text_lower not in item .text ().lower ())


    def update_multithreading_label (self ,text ):
        if self .use_multithreading_checkbox .isChecked ():
            base_text =self ._tr ("use_multithreading_checkbox_base_label","Use Multithreading")
            try :
                num_threads_val =int (text )
                if num_threads_val >0 :self .use_multithreading_checkbox .setText (f"{base_text } ({num_threads_val } Threads)")
                else :self .use_multithreading_checkbox .setText (f"{base_text } (Invalid: >0)")
            except ValueError :
                self .use_multithreading_checkbox .setText (f"{base_text } (Invalid Input)")
        else :
            self .use_multithreading_checkbox .setText (f"{self ._tr ('use_multithreading_checkbox_base_label','Use Multithreading')} (1 Thread)")


    def _handle_multithreading_toggle (self ,checked ):
        if not checked :
            self .thread_count_input .setEnabled (False )
            self .thread_count_label .setEnabled (False )
            self .use_multithreading_checkbox .setText ("Use Multithreading (1 Thread)")
        else :
            self .thread_count_input .setEnabled (True )
            self .thread_count_label .setEnabled (True )
            self .update_multithreading_label (self .thread_count_input .text ())

    def _update_multithreading_for_date_mode (self ):
        """
        Checks if Manga Mode is ON and 'Date Based' style is selected.
        If so, disables multithreading. Otherwise, enables it.
        """
        if not hasattr (self ,'manga_mode_checkbox')or not hasattr (self ,'use_multithreading_checkbox'):
            return 

        manga_on =self .manga_mode_checkbox .isChecked ()
        is_sequential_style_requiring_single_thread =(
        self .manga_filename_style ==STYLE_DATE_BASED or 
        self .manga_filename_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING 
        )
        if manga_on and is_sequential_style_requiring_single_thread :
            if self .use_multithreading_checkbox .isChecked ()or self .use_multithreading_checkbox .isEnabled ():
                if self .use_multithreading_checkbox .isChecked ():
                    self .log_signal .emit ("ℹ️ Manga Date Mode: Multithreading for post processing has been disabled to ensure correct sequential file numbering.")
                self .use_multithreading_checkbox .setChecked (False )
            self .use_multithreading_checkbox .setEnabled (False )
            self ._handle_multithreading_toggle (False )
        else :
            if not self .use_multithreading_checkbox .isEnabled ():
                self .use_multithreading_checkbox .setEnabled (True )
            self ._handle_multithreading_toggle (self .use_multithreading_checkbox .isChecked ())

    def update_progress_display (self ,total_posts ,processed_posts ):
        if total_posts >0 :
            progress_percent =(processed_posts /total_posts )*100 
            self .progress_label .setText (self ._tr ("progress_posts_text","Progress: {processed_posts} / {total_posts} posts ({progress_percent:.1f}%)").format (processed_posts =processed_posts ,total_posts =total_posts ,progress_percent =progress_percent ))
        elif processed_posts >0 :
            self .progress_label .setText (self ._tr ("progress_processing_post_text","Progress: Processing post {processed_posts}...").format (processed_posts =processed_posts ))
        else :
            self .progress_label .setText (self ._tr ("progress_starting_text","Progress: Starting..."))

        if total_posts >0 or processed_posts >0 :
            self .file_progress_label .setText ("")


    def start_download (self ,direct_api_url =None ,override_output_dir =None, is_restore=False ):
        global KNOWN_NAMES ,BackendDownloadThread ,PostProcessorWorker ,extract_post_info ,clean_folder_name ,MAX_FILE_THREADS_PER_POST_OR_WORKER 

        if self ._is_download_active ():
            QMessageBox.warning(self, "Busy", "A download is already in progress.")
            return False 



        if not direct_api_url and self .favorite_download_queue and not self .is_processing_favorites_queue :
            self .log_signal .emit (f"ℹ️ Detected {len (self .favorite_download_queue )} item(s) in the queue. Starting processing...")
            self .cancellation_message_logged_this_session =False 
            self ._process_next_favorite_download ()
            return True 

        if not is_restore and self.interrupted_session_data:
            self.log_signal.emit("ℹ️ New download started. Discarding previous interrupted session.")
            self._clear_session_file()
            self.interrupted_session_data = None
            self.is_restore_pending = False
        api_url =direct_api_url if direct_api_url else self .link_input .text ().strip ()
        self .download_history_candidates .clear ()
        self._update_button_states_and_connections() # Ensure buttons are updated to active state


        if self .favorite_mode_checkbox and self .favorite_mode_checkbox .isChecked ()and not direct_api_url and not api_url :
            QMessageBox .information (self ,"Favorite Mode Active",
            "Favorite Mode is active. Please use the 'Favorite Artists' or 'Favorite Posts' buttons to start downloads in this mode, or uncheck 'Favorite Mode' to use the URL input.")
            self .set_ui_enabled (True )
            return False 

        main_ui_download_dir =self .dir_input .text ().strip ()

        if not api_url and not self .favorite_download_queue :
            QMessageBox .critical (self ,"Input Error","URL is required.")
            return False 
        elif not api_url and self .favorite_download_queue :
            self .log_signal .emit ("ℹ️ URL input is empty, but queue has items. Processing queue...")
            self .cancellation_message_logged_this_session =False 
            self ._process_next_favorite_download ()
            return True 

        self .cancellation_message_logged_this_session =False 
        use_subfolders =self .use_subfolders_checkbox .isChecked ()
        use_post_subfolders =self .use_subfolder_per_post_checkbox .isChecked ()
        compress_images =self .compress_images_checkbox .isChecked ()
        download_thumbnails =self .download_thumbnails_checkbox .isChecked ()

        use_multithreading_enabled_by_checkbox =self .use_multithreading_checkbox .isChecked ()
        try :
            num_threads_from_gui =int (self .thread_count_input .text ().strip ())
            if num_threads_from_gui <1 :num_threads_from_gui =1 
        except ValueError :
            QMessageBox .critical (self ,"Thread Count Error","Invalid number of threads. Please enter a positive number.")
            return False 

        if use_multithreading_enabled_by_checkbox :
            if num_threads_from_gui >MAX_THREADS :
                hard_warning_msg =(
                f"You've entered a thread count ({num_threads_from_gui }) exceeding the maximum of {MAX_THREADS }.\n\n"
                "Using an extremely high number of threads can lead to:\n"
                "  - Diminishing returns (no significant speed increase).\n"
                "  - Increased system instability or application crashes.\n"
                "  - Higher chance of being rate-limited or temporarily IP-banned by the server.\n\n"
                f"The thread count has been automatically capped to {MAX_THREADS } for stability."
                )
                QMessageBox .warning (self ,"High Thread Count Warning",hard_warning_msg )
                num_threads_from_gui =MAX_THREADS 
                self .thread_count_input .setText (str (MAX_THREADS ))
                self .log_signal .emit (f"⚠️ User attempted {num_threads_from_gui } threads, capped to {MAX_THREADS }.")
            if SOFT_WARNING_THREAD_THRESHOLD <num_threads_from_gui <=MAX_THREADS :
                soft_warning_msg_box =QMessageBox (self )
                soft_warning_msg_box .setIcon (QMessageBox .Question )
                soft_warning_msg_box .setWindowTitle ("Thread Count Advisory")
                soft_warning_msg_box .setText (
                f"You've set the thread count to {num_threads_from_gui }.\n\n"
                "While this is within the allowed limit, using a high number of threads (typically above 40-50) can sometimes lead to:\n"
                "  - Increased errors or failed file downloads.\n"
                "  - Connection issues with the server.\n"
                "  - Higher system resource usage.\n\n"
                "For most users and connections, 10-30 threads provide a good balance.\n\n"
                f"Do you want to proceed with {num_threads_from_gui } threads, or would you like to change the value?"
                )
                proceed_button =soft_warning_msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
                change_button =soft_warning_msg_box .addButton ("Change Thread Value",QMessageBox .RejectRole )
                soft_warning_msg_box .setDefaultButton (proceed_button )
                soft_warning_msg_box .setEscapeButton (change_button )
                soft_warning_msg_box .exec_ ()

                if soft_warning_msg_box .clickedButton ()==change_button :
                    self .log_signal .emit (f"ℹ️ User opted to change thread count from {num_threads_from_gui } after advisory.")
                    self .thread_count_input .setFocus ()
                    self .thread_count_input .selectAll ()
                    return False 

        raw_skip_words =self .skip_words_input .text ().strip ()
        skip_words_list =[word .strip ().lower ()for word in raw_skip_words .split (',')if word .strip ()]

        raw_remove_filename_words =self .remove_from_filename_input .text ().strip ()if hasattr (self ,'remove_from_filename_input')else ""
        allow_multipart =self .allow_multipart_download_setting 
        remove_from_filename_words_list =[word .strip ()for word in raw_remove_filename_words .split (',')if word .strip ()]
        scan_content_for_images =self .scan_content_images_checkbox .isChecked ()if hasattr (self ,'scan_content_images_checkbox')else False 
        use_cookie_from_checkbox =self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False 
        app_base_dir_for_cookies =os .path .dirname (self .config_file )
        cookie_text_from_input =self .cookie_text_input .text ().strip ()if hasattr (self ,'cookie_text_input')and use_cookie_from_checkbox else ""

        use_cookie_for_this_run =use_cookie_from_checkbox 
        selected_cookie_file_path_for_backend =self .selected_cookie_filepath if use_cookie_from_checkbox and self .selected_cookie_filepath else None 

        if use_cookie_from_checkbox and not direct_api_url :
            temp_cookies_for_check =prepare_cookies_for_request (
            use_cookie_for_this_run ,
            cookie_text_from_input ,
            selected_cookie_file_path_for_backend ,
            app_base_dir_for_cookies ,
            lambda msg :self .log_signal .emit (f"[UI Cookie Check] {msg }")
            )
            if temp_cookies_for_check is None :
                cookie_dialog =CookieHelpDialog (self ,self ,offer_download_without_option =True )
                dialog_exec_result =cookie_dialog .exec_ ()

                if cookie_dialog .user_choice ==CookieHelpDialog .CHOICE_PROCEED_WITHOUT_COOKIES and dialog_exec_result ==QDialog .Accepted :
                    self .log_signal .emit ("ℹ️ User chose to download without cookies for this session.")
                    use_cookie_for_this_run =False 
                elif cookie_dialog .user_choice ==CookieHelpDialog .CHOICE_CANCEL_DOWNLOAD or dialog_exec_result ==QDialog .Rejected :
                    self .log_signal .emit ("❌ Download cancelled by user at cookie prompt.")
                    return False 
                else :
                    self .log_signal .emit ("⚠️ Cookie dialog closed or unexpected choice. Aborting download.")
                    return False 

        current_skip_words_scope =self .get_skip_words_scope ()
        manga_mode_is_checked =self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False 

        extract_links_only =(self .radio_only_links and self .radio_only_links .isChecked ())
        backend_filter_mode =self .get_filter_mode ()
        checked_radio_button =self .radio_group .checkedButton ()
        user_selected_filter_text =checked_radio_button .text ()if checked_radio_button else "All"

        effective_output_dir_for_run =""

        if selected_cookie_file_path_for_backend :
            cookie_text_from_input =""

        if backend_filter_mode =='archive':
            effective_skip_zip =False 
            effective_skip_rar =False 
        else :
            effective_skip_zip =self .skip_zip_checkbox .isChecked ()
            effective_skip_rar =self .skip_rar_checkbox .isChecked ()
            if backend_filter_mode =='audio':
                effective_skip_zip =self .skip_zip_checkbox .isChecked ()
                effective_skip_rar =self .skip_rar_checkbox .isChecked ()

        if not api_url :
            QMessageBox .critical (self ,"Input Error","URL is required.")
            return False 

        if override_output_dir :
            if not main_ui_download_dir :
                QMessageBox .critical (self ,"Configuration Error",
                "The main 'Download Location' must be set in the UI "
                "before downloading favorites with 'Artist Folders' scope.")
                if self .is_processing_favorites_queue :
                    self .log_signal .emit (f"❌ Favorite download for '{api_url }' skipped: Main download directory not set.")
                return False 

            if not os .path .isdir (main_ui_download_dir ):
                QMessageBox .critical (self ,"Directory Error",
                f"The main 'Download Location' ('{main_ui_download_dir }') "
                "does not exist or is not a directory. Please set a valid one for 'Artist Folders' scope.")
                if self .is_processing_favorites_queue :
                    self .log_signal .emit (f"❌ Favorite download for '{api_url }' skipped: Main download directory invalid.")
                return False 
            effective_output_dir_for_run =os .path .normpath (override_output_dir )
        else :
            if not extract_links_only and not main_ui_download_dir :
                QMessageBox .critical (self ,"Input Error","Download Directory is required when not in 'Only Links' mode.")
                return False 

            if not extract_links_only and main_ui_download_dir and not os .path .isdir (main_ui_download_dir ):
                reply =QMessageBox .question (self ,"Create Directory?",
                f"The directory '{main_ui_download_dir }' does not exist.\nCreate it now?",
                QMessageBox .Yes |QMessageBox .No ,QMessageBox .Yes )
                if reply ==QMessageBox .Yes :
                    try :
                        os .makedirs (main_ui_download_dir ,exist_ok =True )
                        self .log_signal .emit (f"ℹ️ Created directory: {main_ui_download_dir }")
                    except Exception as e :
                        QMessageBox .critical (self ,"Directory Error",f"Could not create directory: {e }")
                        return False 
                else :
                    self .log_signal .emit ("❌ Download cancelled: Output directory does not exist and was not created.")
                    return False 
            effective_output_dir_for_run =os .path .normpath (main_ui_download_dir )

        service ,user_id ,post_id_from_url =extract_post_info (api_url )
        if not service or not user_id :
            QMessageBox .critical (self ,"Input Error","Invalid or unsupported URL format.")
            return False 


            self ._process_next_favorite_download ()
            return True 


        if self .favorite_mode_checkbox and self .favorite_mode_checkbox .isChecked ()and not direct_api_url :
            QMessageBox .information (self ,"Favorite Mode Active",

            "Favorite Mode is active. Please use the 'Favorite Artists' or 'Favorite Posts' buttons to start downloads in this mode, or uncheck 'Favorite Mode' to use the URL input.")
            self .set_ui_enabled (True )
            return 
            return False 
        api_url =direct_api_url if direct_api_url else self .link_input .text ().strip ()
        main_ui_download_dir =self .dir_input .text ().strip ()

        self .cancellation_message_logged_this_session =False 
        use_subfolders =self .use_subfolders_checkbox .isChecked ()
        use_post_subfolders =self .use_subfolder_per_post_checkbox .isChecked ()
        compress_images =self .compress_images_checkbox .isChecked ()
        download_thumbnails =self .download_thumbnails_checkbox .isChecked ()

        use_multithreading_enabled_by_checkbox =self .use_multithreading_checkbox .isChecked ()
        try :
            num_threads_from_gui =int (self .thread_count_input .text ().strip ())
            if num_threads_from_gui <1 :num_threads_from_gui =1 
        except ValueError :
            QMessageBox .critical (self ,"Thread Count Error","Invalid number of threads. Please enter a positive number.")
            return False 

        if use_multithreading_enabled_by_checkbox :
            if num_threads_from_gui >MAX_THREADS :
                hard_warning_msg =(
                f"You've entered a thread count ({num_threads_from_gui }) exceeding the maximum of {MAX_THREADS }.\n\n"
                "Using an extremely high number of threads can lead to:\n"
                "  - Diminishing returns (no significant speed increase).\n"
                "  - Increased system instability or application crashes.\n"
                "  - Higher chance of being rate-limited or temporarily IP-banned by the server.\n\n"
                f"The thread count has been automatically capped to {MAX_THREADS } for stability."
                )
                QMessageBox .warning (self ,"High Thread Count Warning",hard_warning_msg )
                num_threads_from_gui =MAX_THREADS 
                self .thread_count_input .setText (str (MAX_THREADS ))
                self .log_signal .emit (f"⚠️ User attempted {num_threads_from_gui } threads, capped to {MAX_THREADS }.")
            if SOFT_WARNING_THREAD_THRESHOLD <num_threads_from_gui <=MAX_THREADS :
                soft_warning_msg_box =QMessageBox (self )
                soft_warning_msg_box .setIcon (QMessageBox .Question )
                soft_warning_msg_box .setWindowTitle ("Thread Count Advisory")
                soft_warning_msg_box .setText (
                f"You've set the thread count to {num_threads_from_gui }.\n\n"
                "While this is within the allowed limit, using a high number of threads (typically above 40-50) can sometimes lead to:\n"
                "  - Increased errors or failed file downloads.\n"
                "  - Connection issues with the server.\n"
                "  - Higher system resource usage.\n\n"
                "For most users and connections, 10-30 threads provide a good balance.\n\n"
                f"Do you want to proceed with {num_threads_from_gui } threads, or would you like to change the value?"
                )
                proceed_button =soft_warning_msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
                change_button =soft_warning_msg_box .addButton ("Change Thread Value",QMessageBox .RejectRole )
                soft_warning_msg_box .setDefaultButton (proceed_button )
                soft_warning_msg_box .setEscapeButton (change_button )
                soft_warning_msg_box .exec_ ()

                if soft_warning_msg_box .clickedButton ()==change_button :
                    self .log_signal .emit (f"ℹ️ User opted to change thread count from {num_threads_from_gui } after advisory.")
                    self .thread_count_input .setFocus ()
                    self .thread_count_input .selectAll ()
                    return False 

        raw_skip_words =self .skip_words_input .text ().strip ()
        skip_words_list =[word .strip ().lower ()for word in raw_skip_words .split (',')if word .strip ()]

        raw_remove_filename_words =self .remove_from_filename_input .text ().strip ()if hasattr (self ,'remove_from_filename_input')else ""
        allow_multipart =self .allow_multipart_download_setting 
        remove_from_filename_words_list =[word .strip ()for word in raw_remove_filename_words .split (',')if word .strip ()]
        scan_content_for_images =self .scan_content_images_checkbox .isChecked ()if hasattr (self ,'scan_content_images_checkbox')else False 
        use_cookie_from_checkbox =self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False 
        app_base_dir_for_cookies =os .path .dirname (self .config_file )
        cookie_text_from_input =self .cookie_text_input .text ().strip ()if hasattr (self ,'cookie_text_input')and use_cookie_from_checkbox else ""

        use_cookie_for_this_run =use_cookie_from_checkbox 
        selected_cookie_file_path_for_backend =self .selected_cookie_filepath if use_cookie_from_checkbox and self .selected_cookie_filepath else None 

        if use_cookie_from_checkbox and not direct_api_url :
            temp_cookies_for_check =prepare_cookies_for_request (
            use_cookie_for_this_run ,
            cookie_text_from_input ,
            selected_cookie_file_path_for_backend ,
            app_base_dir_for_cookies ,
            lambda msg :self .log_signal .emit (f"[UI Cookie Check] {msg }")
            )
            if temp_cookies_for_check is None :
                cookie_dialog =CookieHelpDialog (self ,self ,offer_download_without_option =True )
                dialog_exec_result =cookie_dialog .exec_ ()

                if cookie_dialog .user_choice ==CookieHelpDialog .CHOICE_PROCEED_WITHOUT_COOKIES and dialog_exec_result ==QDialog .Accepted :
                    self .log_signal .emit ("ℹ️ User chose to download without cookies for this session.")
                    use_cookie_for_this_run =False 
                elif cookie_dialog .user_choice ==CookieHelpDialog .CHOICE_CANCEL_DOWNLOAD or dialog_exec_result ==QDialog .Rejected :
                    self .log_signal .emit ("❌ Download cancelled by user at cookie prompt.")
                    return False 
                else :
                    self .log_signal .emit ("⚠️ Cookie dialog closed or unexpected choice. Aborting download.")
                    return False 

        current_skip_words_scope =self .get_skip_words_scope ()
        manga_mode_is_checked =self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False 

        extract_links_only =(self .radio_only_links and self .radio_only_links .isChecked ())
        backend_filter_mode =self .get_filter_mode ()
        checked_radio_button =self .radio_group .checkedButton ()
        user_selected_filter_text =checked_radio_button .text ()if checked_radio_button else "All"


        effective_output_dir_for_run =""

        if selected_cookie_file_path_for_backend :
            cookie_text_from_input =""

        if backend_filter_mode =='archive':
            effective_skip_zip =False 
            effective_skip_rar =False 
        else :
            effective_skip_zip =self .skip_zip_checkbox .isChecked ()
            effective_skip_rar =self .skip_rar_checkbox .isChecked ()
            if backend_filter_mode =='audio':
                effective_skip_zip =self .skip_zip_checkbox .isChecked ()
                effective_skip_rar =self .skip_rar_checkbox .isChecked ()

        if not api_url :
            QMessageBox .critical (self ,"Input Error","URL is required.")
            return False 

        if override_output_dir :
            if not main_ui_download_dir :
                QMessageBox .critical (self ,"Configuration Error",
                "The main 'Download Location' must be set in the UI "
                "before downloading favorites with 'Artist Folders' scope.")
                if self .is_processing_favorites_queue :
                    self .log_signal .emit (f"❌ Favorite download for '{api_url }' skipped: Main download directory not set.")
                return False 

            if not os .path .isdir (main_ui_download_dir ):
                QMessageBox .critical (self ,"Directory Error",
                f"The main 'Download Location' ('{main_ui_download_dir }') "
                "does not exist or is not a directory. Please set a valid one for 'Artist Folders' scope.")
                if self .is_processing_favorites_queue :
                    self .log_signal .emit (f"❌ Favorite download for '{api_url }' skipped: Main download directory invalid.")
                return False 
            effective_output_dir_for_run =os .path .normpath (override_output_dir )
        else :
            if not extract_links_only and not main_ui_download_dir :
                QMessageBox .critical (self ,"Input Error","Download Directory is required when not in 'Only Links' mode.")
                return False 

            if not extract_links_only and main_ui_download_dir and not os .path .isdir (main_ui_download_dir ):
                reply =QMessageBox .question (self ,"Create Directory?",
                f"The directory '{main_ui_download_dir }' does not exist.\nCreate it now?",
                QMessageBox .Yes |QMessageBox .No ,QMessageBox .Yes )
                if reply ==QMessageBox .Yes :
                    try :
                        os .makedirs (main_ui_download_dir ,exist_ok =True )
                        self .log_signal .emit (f"ℹ️ Created directory: {main_ui_download_dir }")
                    except Exception as e :
                        QMessageBox .critical (self ,"Directory Error",f"Could not create directory: {e }")
                        return False 
                else :
                    self .log_signal .emit ("❌ Download cancelled: Output directory does not exist and was not created.")
                    return False 
            effective_output_dir_for_run =os .path .normpath (main_ui_download_dir )

        service ,user_id ,post_id_from_url =extract_post_info (api_url )
        if not service or not user_id :
            QMessageBox .critical (self ,"Input Error","Invalid or unsupported URL format.")
            return False 

        creator_folder_ignore_words_for_run =None 
        is_full_creator_download =not post_id_from_url 

        if compress_images and Image is None :
            QMessageBox .warning (self ,"Missing Dependency","Pillow library (for image compression) not found. Compression will be disabled.")
            compress_images =False ;self .compress_images_checkbox .setChecked (False )

        log_messages =["="*40 ,f"🚀 Starting {'Link Extraction'if extract_links_only else ('Archive Download'if backend_filter_mode =='archive'else 'Download')} @ {time .strftime ('%Y-%m-%d %H:%M:%S')}",f"    URL: {api_url }"]

        current_mode_log_text ="Download"
        if extract_links_only :current_mode_log_text ="Link Extraction"
        elif backend_filter_mode =='archive':current_mode_log_text ="Archive Download"
        elif backend_filter_mode =='audio':current_mode_log_text ="Audio Download"

        current_char_filter_scope =self .get_char_filter_scope ()
        manga_mode =manga_mode_is_checked and not post_id_from_url 

        manga_date_prefix_text =""
        if manga_mode and (self .manga_filename_style ==STYLE_DATE_BASED or self .manga_filename_style ==STYLE_ORIGINAL_NAME )and hasattr (self ,'manga_date_prefix_input'):
            manga_date_prefix_text =self .manga_date_prefix_input .text ().strip ()
            if manga_date_prefix_text :
                log_messages .append (f"      ↳ Manga Date Prefix: '{manga_date_prefix_text }'")

        start_page_str ,end_page_str =self .start_page_input .text ().strip (),self .end_page_input .text ().strip ()
        start_page ,end_page =None ,None 
        is_creator_feed =bool (not post_id_from_url )

        if is_creator_feed :
            try :
                if start_page_str :start_page =int (start_page_str )
                if end_page_str :end_page =int (end_page_str )

                if start_page is not None and start_page <=0 :raise ValueError ("Start page must be positive.")
                if end_page is not None and end_page <=0 :raise ValueError ("End page must be positive.")
                if start_page and end_page and start_page >end_page :raise ValueError ("Start page cannot be greater than end page.")

                if manga_mode and start_page and end_page :
                    msg_box =QMessageBox (self )
                    msg_box .setIcon (QMessageBox .Warning )
                    msg_box .setWindowTitle ("Manga Mode & Page Range Warning")
                    msg_box .setText (
                    "You have enabled <b>Manga/Comic Mode</b> and also specified a <b>Page Range</b>.\n\n"
                    "Manga Mode processes posts from oldest to newest across all available pages by default.\n"
                    "If you use a page range, you might miss parts of the manga/comic if it starts before your 'Start Page' or continues after your 'End Page'.\n\n"
                    "However, if you are certain the content you want is entirely within this page range (e.g., a short series, or you know the specific pages for a volume), then proceeding is okay.\n\n"
                    "Do you want to proceed with this page range in Manga Mode?"
                    )
                    proceed_button =msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
                    cancel_button =msg_box .addButton ("Cancel Download",QMessageBox .RejectRole )
                    msg_box .setDefaultButton (proceed_button )
                    msg_box .setEscapeButton (cancel_button )
                    msg_box .exec_ ()

                    if msg_box .clickedButton ()==cancel_button :
                        self .log_signal .emit ("❌ Download cancelled by user due to Manga Mode & Page Range warning.")
                        return False 
            except ValueError as e :
                QMessageBox .critical (self ,"Page Range Error",f"Invalid page range: {e }")
                return False 
        self .external_link_queue .clear ();self .extracted_links_cache =[];self ._is_processing_external_link_queue =False ;self ._current_link_post_title =None 

        raw_character_filters_text =self .character_input .text ().strip ()
        parsed_character_filter_objects =self ._parse_character_filters (raw_character_filters_text )

        actual_filters_to_use_for_run =[]

        needs_folder_naming_validation =(use_subfolders or manga_mode )and not extract_links_only 

        if parsed_character_filter_objects :
            actual_filters_to_use_for_run =parsed_character_filter_objects 

            if not extract_links_only :
                self .log_signal .emit (f"ℹ️ Using character filters for matching: {', '.join (item ['name']for item in actual_filters_to_use_for_run )}")

                filter_objects_to_potentially_add_to_known_list =[]
                for filter_item_obj in parsed_character_filter_objects :
                    item_primary_name =filter_item_obj ["name"]
                    cleaned_name_test =clean_folder_name (item_primary_name )
                    if needs_folder_naming_validation and not cleaned_name_test :
                        QMessageBox .warning (self ,"Invalid Filter Name for Folder",f"Filter name '{item_primary_name }' is invalid for a folder and will be skipped for Known.txt interaction.")
                        self .log_signal .emit (f"⚠️ Skipping invalid filter for Known.txt interaction: '{item_primary_name }'")
                        continue 

                    an_alias_is_already_known =False 
                    if any (kn_entry ["name"].lower ()==item_primary_name .lower ()for kn_entry in KNOWN_NAMES ):
                        an_alias_is_already_known =True 
                    elif filter_item_obj ["is_group"]and needs_folder_naming_validation :
                        for alias_in_filter_obj in filter_item_obj ["aliases"]:
                            if any (kn_entry ["name"].lower ()==alias_in_filter_obj .lower ()or alias_in_filter_obj .lower ()in [a .lower ()for a in kn_entry ["aliases"]]for kn_entry in KNOWN_NAMES ):
                                an_alias_is_already_known =True ;break 

                    if an_alias_is_already_known and filter_item_obj ["is_group"]:
                        self .log_signal .emit (f"ℹ️ An alias from group '{item_primary_name }' is already known. Group will not be prompted for Known.txt addition.")

                    should_prompt_to_add_to_known_list =(
                    needs_folder_naming_validation and not manga_mode and 
                    not any (kn_entry ["name"].lower ()==item_primary_name .lower ()for kn_entry in KNOWN_NAMES )and 
                    not an_alias_is_already_known 
                    )
                    if should_prompt_to_add_to_known_list :
                        if not any (obj_to_add ["name"].lower ()==item_primary_name .lower ()for obj_to_add in filter_objects_to_potentially_add_to_known_list ):
                            filter_objects_to_potentially_add_to_known_list .append (filter_item_obj )
                    elif manga_mode and needs_folder_naming_validation and item_primary_name .lower ()not in {kn_entry ["name"].lower ()for kn_entry in KNOWN_NAMES }and not an_alias_is_already_known :
                        self .log_signal .emit (f"ℹ️ Manga Mode: Using filter '{item_primary_name }' for this session without adding to Known Names.")

                if filter_objects_to_potentially_add_to_known_list :
                    confirm_dialog =ConfirmAddAllDialog (filter_objects_to_potentially_add_to_known_list ,self ,self )
                    dialog_result =confirm_dialog .exec_ ()

                    if dialog_result ==CONFIRM_ADD_ALL_CANCEL_DOWNLOAD :
                        self .log_signal .emit ("❌ Download cancelled by user at new name confirmation stage.")
                        return False 
                    elif isinstance (dialog_result ,list ):
                        if dialog_result :
                            self .log_signal .emit (f"ℹ️ User chose to add {len (dialog_result )} new entry/entries to Known.txt.")
                            for filter_obj_to_add in dialog_result :
                                if filter_obj_to_add .get ("components_are_distinct_for_known_txt"):
                                    self .log_signal .emit (f"    Processing group '{filter_obj_to_add ['name']}' to add its components individually to Known.txt.")
                                    for alias_component in filter_obj_to_add ["aliases"]:
                                        self .add_new_character (
                                        name_to_add =alias_component ,
                                        is_group_to_add =False ,
                                        aliases_to_add =[alias_component ],
                                        suppress_similarity_prompt =True 
                                        )
                                else :
                                    self .add_new_character (
                                    name_to_add =filter_obj_to_add ["name"],
                                    is_group_to_add =filter_obj_to_add ["is_group"],
                                    aliases_to_add =filter_obj_to_add ["aliases"],
                                    suppress_similarity_prompt =True 
                                    )
                        else :
                            self .log_signal .emit ("ℹ️ User confirmed adding, but no names were selected in the dialog. No new names added to Known.txt.")
                    elif dialog_result ==CONFIRM_ADD_ALL_SKIP_ADDING :
                        self .log_signal .emit ("ℹ️ User chose not to add new names to Known.txt for this session.")
            else :
                self .log_signal .emit (f"ℹ️ Using character filters for link extraction: {', '.join (item ['name']for item in actual_filters_to_use_for_run )}")


        if manga_mode and not actual_filters_to_use_for_run and not extract_links_only :
            msg_box =QMessageBox (self )
            msg_box .setIcon (QMessageBox .Warning )
            msg_box .setWindowTitle ("Manga Mode Filter Warning")
            msg_box .setText (
            "Manga Mode is enabled, but 'Filter by Character(s)' is empty.\n\n"
            "For best results (correct file naming and folder organization if subfolders are on), "
            "please enter the Manga/Series title into the filter field.\n\n"
            "Proceed without a filter (names might be generic, folder might be less specific)?"
            )
            proceed_button =msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
            cancel_button =msg_box .addButton ("Cancel Download",QMessageBox .RejectRole )
            msg_box .exec_ ()
            if msg_box .clickedButton ()==cancel_button :
                self .log_signal .emit ("❌ Download cancelled due to Manga Mode filter warning.")
                return False 
            else :
                self .log_signal .emit ("⚠️ Proceeding with Manga Mode without a specific title filter.")
        self .dynamic_character_filter_holder .set_filters (actual_filters_to_use_for_run )


        creator_folder_ignore_words_for_run =None 
        character_filters_are_empty =not actual_filters_to_use_for_run 
        if is_full_creator_download and character_filters_are_empty :
            creator_folder_ignore_words_for_run =CREATOR_DOWNLOAD_DEFAULT_FOLDER_IGNORE_WORDS 
            log_messages .append (f"    Creator Download (No Char Filter): Applying default folder name ignore list ({len (creator_folder_ignore_words_for_run )} words).")

        custom_folder_name_cleaned =None 
        if use_subfolders and post_id_from_url and self .custom_folder_widget and self .custom_folder_widget .isVisible ()and not extract_links_only :
            raw_custom_name =self .custom_folder_input .text ().strip ()
            if raw_custom_name :
                cleaned_custom =clean_folder_name (raw_custom_name )
                if cleaned_custom :custom_folder_name_cleaned =cleaned_custom 
                else :self .log_signal .emit (f"⚠️ Invalid custom folder name ignored: '{raw_custom_name }' (resulted in empty string after cleaning).")


        self .main_log_output .clear ()
        if extract_links_only :self .main_log_output .append ("🔗 Extracting Links...");
        elif backend_filter_mode =='archive':self .main_log_output .append ("📦 Downloading Archives Only...")

        if self .external_log_output :self .external_log_output .clear ()
        if self .show_external_links and not extract_links_only and backend_filter_mode !='archive':
            self .external_log_output .append ("🔗 External Links Found:")

        self .file_progress_label .setText ("");self .cancellation_event .clear ();self .active_futures =[]
        self .total_posts_to_process =0 ;self .processed_posts_count =0 ;self .download_counter =0 ;self .skip_counter =0 
        self .progress_label .setText (self ._tr ("progress_initializing_text","Progress: Initializing..."))

        self .retryable_failed_files_info .clear ()
        self .permanently_failed_files_for_dialog .clear ()

        manga_date_file_counter_ref_for_thread =None 
        if manga_mode and self .manga_filename_style ==STYLE_DATE_BASED and not extract_links_only :
            manga_date_file_counter_ref_for_thread =None 
            self .log_signal .emit (f"ℹ️ Manga Date Mode: File counter will be initialized by the download thread.")

        manga_global_file_counter_ref_for_thread =None 
        if manga_mode and self .manga_filename_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING and not extract_links_only :
            manga_global_file_counter_ref_for_thread =None 
            self .log_signal .emit (f"ℹ️ Manga Title+GlobalNum Mode: File counter will be initialized by the download thread (starts at 1).")

        effective_num_post_workers =1 

        effective_num_file_threads_per_worker =1 

        if post_id_from_url :
            if use_multithreading_enabled_by_checkbox :
                effective_num_file_threads_per_worker =max (1 ,min (num_threads_from_gui ,MAX_FILE_THREADS_PER_POST_OR_WORKER ))
        else :
            if manga_mode and self .manga_filename_style ==STYLE_DATE_BASED :
                effective_num_post_workers =1 
            elif manga_mode and self .manga_filename_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING :
                effective_num_post_workers =1 
                effective_num_file_threads_per_worker =1 
            elif use_multithreading_enabled_by_checkbox :
                effective_num_post_workers =max (1 ,min (num_threads_from_gui ,MAX_THREADS ))
                effective_num_file_threads_per_worker =1 

        if not extract_links_only :log_messages .append (f"    Save Location: {effective_output_dir_for_run }")

        if post_id_from_url :
            log_messages .append (f"    Mode: Single Post")
            log_messages .append (f"      ↳ File Downloads: Up to {effective_num_file_threads_per_worker } concurrent file(s)")
        else :
            log_messages .append (f"    Mode: Creator Feed")
            log_messages .append (f"    Post Processing: {'Multi-threaded ('+str (effective_num_post_workers )+' workers)'if effective_num_post_workers >1 else 'Single-threaded (1 worker)'}")
            log_messages .append (f"      ↳ File Downloads per Worker: Up to {effective_num_file_threads_per_worker } concurrent file(s)")
            pr_log ="All"
            if start_page or end_page :
                pr_log =f"{f'From {start_page } 'if start_page else ''}{'to 'if start_page and end_page else ''}{f'{end_page }'if end_page else (f'Up to {end_page }'if end_page else (f'From {start_page }'if start_page else 'Specific Range'))}".strip ()

            if manga_mode :
                log_messages .append (f"    Page Range: {pr_log if pr_log else 'All'} (Manga Mode - Oldest Posts Processed First within range)")
            else :
                log_messages .append (f"    Page Range: {pr_log if pr_log else 'All'}")


        if not extract_links_only :
            log_messages .append (f"    Subfolders: {'Enabled'if use_subfolders else 'Disabled'}")
            if use_subfolders :
                if custom_folder_name_cleaned :log_messages .append (f"    Custom Folder (Post): '{custom_folder_name_cleaned }'")
            if actual_filters_to_use_for_run :
                log_messages .append (f"    Character Filters: {', '.join (item ['name']for item in actual_filters_to_use_for_run )}")
                log_messages .append (f"      ↳ Char Filter Scope: {current_char_filter_scope .capitalize ()}")
            elif use_subfolders :
                log_messages .append (f"    Folder Naming: Automatic (based on title/known names)")


            log_messages .extend ([
            f"    File Type Filter: {user_selected_filter_text } (Backend processing as: {backend_filter_mode })",
            f"    Skip Archives: {'.zip'if effective_skip_zip else ''}{', 'if effective_skip_zip and effective_skip_rar else ''}{'.rar'if effective_skip_rar else ''}{'None (Archive Mode)'if backend_filter_mode =='archive'else ('None'if not (effective_skip_zip or effective_skip_rar )else '')}",
            f"    Skip Words (posts/files): {', '.join (skip_words_list )if skip_words_list else 'None'}",
            f"    Skip Words Scope: {current_skip_words_scope .capitalize ()}",
            f"    Remove Words from Filename: {', '.join (remove_from_filename_words_list )if remove_from_filename_words_list else 'None'}",
            f"    Compress Images: {'Enabled'if compress_images else 'Disabled'}",
            f"    Thumbnails Only: {'Enabled'if download_thumbnails else 'Disabled'}"
            ])
            log_messages .append (f"    Scan Post Content for Images: {'Enabled'if scan_content_for_images else 'Disabled'}")
        else :
            log_messages .append (f"    Mode: Extracting Links Only")

        log_messages .append (f"    Show External Links: {'Enabled'if self .show_external_links and not extract_links_only and backend_filter_mode !='archive'else 'Disabled'}")

        if manga_mode :
            log_messages .append (f"    Manga Mode (File Renaming by Post Title): Enabled")
            log_messages .append (f"      ↳ Manga Filename Style: {'Post Title Based'if self .manga_filename_style ==STYLE_POST_TITLE else 'Original File Name'}")
            if actual_filters_to_use_for_run :
                log_messages .append (f"      ↳ Manga Character Filter (for naming/folder): {', '.join (item ['name']for item in actual_filters_to_use_for_run )}")
            log_messages .append (f"      ↳ Manga Duplicates: Will be renamed with numeric suffix if names clash (e.g., _1, _2).")

        log_messages .append (f"    Use Cookie ('cookies.txt'): {'Enabled'if use_cookie_from_checkbox else 'Disabled'}")
        if use_cookie_from_checkbox and cookie_text_from_input :
            log_messages .append (f"      ↳ Cookie Text Provided: Yes (length: {len (cookie_text_from_input )})")
        elif use_cookie_from_checkbox and selected_cookie_file_path_for_backend :
            log_messages .append (f"      ↳ Cookie File Selected: {os .path .basename (selected_cookie_file_path_for_backend )}")
        should_use_multithreading_for_posts =use_multithreading_enabled_by_checkbox and not post_id_from_url 
        if manga_mode and (self .manga_filename_style ==STYLE_DATE_BASED or self .manga_filename_style ==STYLE_POST_TITLE_GLOBAL_NUMBERING )and not post_id_from_url :
            enforced_by_style ="Date Mode"if self .manga_filename_style ==STYLE_DATE_BASED else "Title+GlobalNum Mode"
            should_use_multithreading_for_posts =False 
            log_messages .append (f"    Threading: Single-threaded (posts) - Enforced by Manga {enforced_by_style } (Actual workers: {effective_num_post_workers if effective_num_post_workers >1 else 1 })")
        else :
            log_messages .append (f"    Threading: {'Multi-threaded (posts)'if should_use_multithreading_for_posts else 'Single-threaded (posts)'}")
        if should_use_multithreading_for_posts :
            log_messages .append (f"    Number of Post Worker Threads: {effective_num_post_workers }")
        log_messages .append ("="*40 )
        for msg in log_messages :self .log_signal .emit (msg )

        self .set_ui_enabled (False )


        from src.config.constants import FOLDER_NAME_STOP_WORDS


        args_template ={
        'api_url_input':api_url ,
        'download_root':effective_output_dir_for_run ,
        'output_dir':effective_output_dir_for_run ,
        'known_names':list (KNOWN_NAMES ),
        'known_names_copy':list (KNOWN_NAMES ),
        'filter_character_list':actual_filters_to_use_for_run ,
        'filter_mode':backend_filter_mode ,
        'skip_zip':effective_skip_zip ,
        'skip_rar':effective_skip_rar ,
        'use_subfolders':use_subfolders ,
        'use_post_subfolders':use_post_subfolders ,
        'compress_images':compress_images ,
        'download_thumbnails':download_thumbnails ,
        'service':service ,
        'user_id':user_id ,
        'downloaded_files':self .downloaded_files ,
        'downloaded_files_lock':self .downloaded_files_lock ,
        'downloaded_file_hashes':self .downloaded_file_hashes ,
        'downloaded_file_hashes_lock':self .downloaded_file_hashes_lock ,
        'skip_words_list':skip_words_list ,
        'skip_words_scope':current_skip_words_scope ,
        'remove_from_filename_words_list':remove_from_filename_words_list ,
        'char_filter_scope':current_char_filter_scope ,
        'show_external_links':self .show_external_links ,
        'extract_links_only':extract_links_only ,
        'start_page':start_page ,
        'end_page':end_page ,
        'target_post_id_from_initial_url':post_id_from_url ,
        'custom_folder_name':custom_folder_name_cleaned ,
        'manga_mode_active':manga_mode ,
        'unwanted_keywords':FOLDER_NAME_STOP_WORDS ,
        'cancellation_event':self .cancellation_event ,
        'manga_date_prefix':manga_date_prefix_text ,
        'dynamic_character_filter_holder':self .dynamic_character_filter_holder ,
        'pause_event':self .pause_event ,
        'scan_content_for_images':scan_content_for_images ,
        'manga_filename_style':self .manga_filename_style ,
        'num_file_threads_for_worker':effective_num_file_threads_per_worker ,
        'manga_date_file_counter_ref':manga_date_file_counter_ref_for_thread ,
        'allow_multipart_download':allow_multipart ,
        'cookie_text':cookie_text_from_input ,
        'selected_cookie_file':selected_cookie_file_path_for_backend ,
        'manga_global_file_counter_ref':manga_global_file_counter_ref_for_thread ,
        'app_base_dir':app_base_dir_for_cookies ,
        'use_cookie':use_cookie_for_this_run ,
        'session_file_path': self.session_file_path,
        'session_lock': self.session_lock,
        'creator_download_folder_ignore_words':creator_folder_ignore_words_for_run ,
        }

        args_template ['override_output_dir']=override_output_dir 
        try :
            if should_use_multithreading_for_posts :
                self .log_signal .emit (f"    Initializing multi-threaded {current_mode_log_text .lower ()} with {effective_num_post_workers } post workers...")
                args_template ['emitter']=self .worker_to_gui_queue 
                self .start_multi_threaded_download (num_post_workers =effective_num_post_workers ,**args_template )
            else :
                self .log_signal .emit (f"    Initializing single-threaded {'link extraction'if extract_links_only else 'download'}...")
                dt_expected_keys =[
                'api_url_input','output_dir','known_names_copy','cancellation_event',
                'filter_character_list','filter_mode','skip_zip','skip_rar',
                'use_subfolders','use_post_subfolders','custom_folder_name',
                'compress_images','download_thumbnails','service','user_id',
                'downloaded_files','downloaded_file_hashes','pause_event','remove_from_filename_words_list',
                'downloaded_files_lock','downloaded_file_hashes_lock','dynamic_character_filter_holder', 'session_file_path',
                'session_lock',
                'skip_words_list','skip_words_scope','char_filter_scope',
                'show_external_links','extract_links_only','num_file_threads_for_worker',
                'start_page','end_page','target_post_id_from_initial_url',
                'manga_date_file_counter_ref',
                'manga_global_file_counter_ref','manga_date_prefix',
                'manga_mode_active','unwanted_keywords','manga_filename_style','scan_content_for_images',
                'allow_multipart_download','use_cookie','cookie_text','app_base_dir','selected_cookie_file','override_output_dir'
                ]
                args_template ['skip_current_file_flag']=None 
                single_thread_args ={key :args_template [key ]for key in dt_expected_keys if key in args_template }
                self .start_single_threaded_download (**single_thread_args )
        except Exception as e :
            self._update_button_states_and_connections() # Re-enable UI if start fails           
            self .log_signal .emit (f"❌ CRITICAL ERROR preparing download: {e }\n{traceback .format_exc ()}")
            QMessageBox .critical (self ,"Start Error",f"Failed to start process:\n{e }")
            self .download_finished (0 ,0 ,False ,[])
            if self .pause_event :self .pause_event .clear ()
            self .is_paused =False 
        return True 

    def restore_download(self):
        """Initiates the download restoration process."""
        if self._is_download_active():
            QMessageBox.warning(self, "Busy", "A download is already in progress.")
            return
        
        if not self.interrupted_session_data:
            self.log_signal.emit("❌ No session data to restore.")
            self._clear_session_and_reset_ui()
            return

        self.log_signal.emit("🔄 Restoring download session...")
        # The main start_download function now handles the restore logic
        self.is_restore_pending = True # Set state to indicate restore is in progress       
        self.start_download(is_restore=True)

    def start_single_threaded_download (self ,**kwargs ):
        global BackendDownloadThread 
        try :
            self .download_thread =BackendDownloadThread (**kwargs )
            if self .pause_event :self .pause_event .clear ()
            self .is_paused =False 
            if hasattr (self .download_thread ,'progress_signal'):self .download_thread .progress_signal .connect (self .handle_main_log )
            if hasattr (self .download_thread ,'add_character_prompt_signal'):self .download_thread .add_character_prompt_signal .connect (self .add_character_prompt_signal )
            if hasattr (self .download_thread ,'finished_signal'):self .download_thread .finished_signal .connect (self .download_finished )
            if hasattr (self .download_thread ,'receive_add_character_result'):self .character_prompt_response_signal .connect (self .download_thread .receive_add_character_result )
            if hasattr (self .download_thread ,'external_link_signal'):self .download_thread .external_link_signal .connect (self .handle_external_link_signal )
            if hasattr (self .download_thread ,'file_progress_signal'):self .download_thread .file_progress_signal .connect (self .update_file_progress_display )
            if hasattr (self .download_thread ,'missed_character_post_signal'):
                self .download_thread .missed_character_post_signal .connect (self .handle_missed_character_post )
            if hasattr (self .download_thread ,'retryable_file_failed_signal'):

                if hasattr (self .download_thread ,'file_successfully_downloaded_signal'):
                    self .download_thread .file_successfully_downloaded_signal .connect (self ._handle_actual_file_downloaded )
                if hasattr (self .download_thread ,'post_processed_for_history_signal'):
                    self .download_thread .post_processed_for_history_signal .connect (self ._add_to_history_candidates )
                self .download_thread .retryable_file_failed_signal .connect (self ._handle_retryable_file_failure )
                if hasattr (self .download_thread ,'permanent_file_failed_signal'):
                    self .download_thread .permanent_file_failed_signal .connect (self ._handle_permanent_file_failure_from_thread )
            self .download_thread .start ()
            self .log_signal .emit ("✅ Single download thread (for posts) started.")
            self._update_button_states_and_connections() # Update buttons after thread starts      
        except Exception as e :
            self .log_signal .emit (f"❌ CRITICAL ERROR starting single-thread: {e }\n{traceback .format_exc ()}")
            QMessageBox .critical (self ,"Thread Start Error",f"Failed to start download process: {e }")
            if self .pause_event :self .pause_event .clear ()
            self .is_paused =False 

    def _show_error_files_dialog (self ):
        """Shows the dialog with files that were skipped due to errors."""
        if not self .permanently_failed_files_for_dialog :
            QMessageBox .information (
            self ,
            self ._tr ("no_errors_logged_title","No Errors Logged"),
            self ._tr ("no_errors_logged_message","No files were recorded as skipped due to errors in the last session or after retries."))
            return 
        dialog =ErrorFilesDialog (self .permanently_failed_files_for_dialog ,self ,self )
        dialog .retry_selected_signal .connect (self ._handle_retry_from_error_dialog )
        dialog .exec_ ()
    def _handle_retry_from_error_dialog (self ,selected_files_to_retry ):
        self ._start_failed_files_retry_session (files_to_retry_list =selected_files_to_retry )

    def _handle_retryable_file_failure (self ,list_of_retry_details ):
        """Appends details of files that failed but might be retryable later."""
        if list_of_retry_details :
            self .retryable_failed_files_info .extend (list_of_retry_details )

    def _handle_permanent_file_failure_from_thread (self ,list_of_permanent_failure_details ):
        """Handles permanently failed files signaled by the single BackendDownloadThread."""
        if list_of_permanent_failure_details :
            self .permanently_failed_files_for_dialog .extend (list_of_permanent_failure_details )
            self .log_signal .emit (f"ℹ️ {len (list_of_permanent_failure_details )} file(s) from single-thread download marked as permanently failed for this session.")

    def _submit_post_to_worker_pool (self ,post_data_item ,worker_args_template ,num_file_dl_threads_for_each_worker ,emitter_for_worker ,ppw_expected_keys ,ppw_optional_keys_with_defaults ):
        """Helper to prepare and submit a single post processing task to the thread pool."""
        global PostProcessorWorker 
        if not isinstance (post_data_item ,dict ):
            self .log_signal .emit (f"⚠️ Skipping invalid post data item (not a dict): {type (post_data_item )}");
            return False 

        worker_init_args ={}
        missing_keys =[]
        for key in ppw_expected_keys :
            if key =='post_data':worker_init_args [key ]=post_data_item 
            elif key =='num_file_threads':worker_init_args [key ]=num_file_dl_threads_for_each_worker 
            elif key =='emitter':worker_init_args [key ]=emitter_for_worker 
            elif key in worker_args_template :worker_init_args [key ]=worker_args_template [key ]
            elif key in ppw_optional_keys_with_defaults :pass 
            else :missing_keys .append (key )

        if missing_keys :
            self .log_signal .emit (f"❌ CRITICAL ERROR: Missing keys for PostProcessorWorker: {', '.join (missing_keys )}");
            self .cancellation_event .set ()
            return False 

        try :
            worker_instance =PostProcessorWorker (**worker_init_args )
            if self .thread_pool :
                future =self .thread_pool .submit (worker_instance .process )
                future .add_done_callback (self ._handle_future_result )
                self .active_futures .append (future )
                return True 
            else :
                self .log_signal .emit ("⚠️ Thread pool not available. Cannot submit task.");
                self .cancellation_event .set ()
                return False 
        except TypeError as te :
            self .log_signal .emit (f"❌ TypeError creating PostProcessorWorker: {te }\n    Passed Args: [{', '.join (sorted (worker_init_args .keys ()))}]\n{traceback .format_exc (limit =5 )}")
            self .cancellation_event .set ()
            return False 
        except RuntimeError :
            self .log_signal .emit (f"⚠️ RuntimeError submitting task (pool likely shutting down).")
            self .cancellation_event .set ()
            return False 
        except Exception as e :
            self .log_signal .emit (f"❌ Error submitting post {post_data_item .get ('id','N/A')} to worker: {e }")
            self .cancellation_event .set ()
            return False 

    def _load_ui_from_settings_dict(self, settings: dict):
        """Populates the UI with values from a settings dictionary."""
        # Text inputs
        self.link_input.setText(settings.get('api_url', ''))
        self.dir_input.setText(settings.get('output_dir', ''))
        self.character_input.setText(settings.get('character_filter_text', ''))
        self.skip_words_input.setText(settings.get('skip_words_text', ''))
        self.remove_from_filename_input.setText(settings.get('remove_words_text', ''))
        self.custom_folder_input.setText(settings.get('custom_folder_name', ''))
        self.cookie_text_input.setText(settings.get('cookie_text', ''))
        if hasattr(self, 'manga_date_prefix_input'):
            self.manga_date_prefix_input.setText(settings.get('manga_date_prefix', ''))

        # Numeric inputs
        self.thread_count_input.setText(str(settings.get('num_threads', 4)))
        self.start_page_input.setText(str(settings.get('start_page', '')) if settings.get('start_page') is not None else '')
        self.end_page_input.setText(str(settings.get('end_page', '')) if settings.get('end_page') is not None else '')
        
        # Checkboxes
        for checkbox_name, key in self.get_checkbox_map().items():
            checkbox = getattr(self, checkbox_name, None)
            if checkbox:
                checkbox.setChecked(settings.get(key, False))

        # Radio buttons
        if settings.get('only_links'): self.radio_only_links.setChecked(True)
        else:
            filter_mode = settings.get('filter_mode', 'all')
            if filter_mode == 'image': self.radio_images.setChecked(True)
            elif filter_mode == 'video': self.radio_videos.setChecked(True)
            elif filter_mode == 'archive': self.radio_only_archives.setChecked(True)
            elif filter_mode == 'audio' and hasattr(self, 'radio_only_audio'): self.radio_only_audio.setChecked(True)
            else: self.radio_all.setChecked(True)

        # Toggle button states
        self.skip_words_scope = settings.get('skip_words_scope', SKIP_SCOPE_POSTS)
        self.char_filter_scope = settings.get('char_filter_scope', CHAR_SCOPE_TITLE)
        self.manga_filename_style = settings.get('manga_filename_style', STYLE_POST_TITLE)
        self.allow_multipart_download_setting = settings.get('allow_multipart_download', False)
        
        # Update button texts after setting states
        self._update_skip_scope_button_text()
        self._update_char_filter_scope_button_text()
        self._update_manga_filename_style_button_text()
        self._update_multipart_toggle_button_text()

    def start_multi_threaded_download (self ,num_post_workers ,**kwargs ):
        global PostProcessorWorker 
        if self .thread_pool is None :
            if self .pause_event :self .pause_event .clear ()
            self .is_paused =False 
            self .thread_pool =ThreadPoolExecutor (max_workers =num_post_workers ,thread_name_prefix ='PostWorker_')

        self .active_futures =[]
        self .processed_posts_count =0 ;self .total_posts_to_process =0 ;self .download_counter =0 ;self .skip_counter =0 
        self .all_kept_original_filenames =[]
        self .is_fetcher_thread_running =True 

        fetcher_thread =threading .Thread (
        target =self ._fetch_and_queue_posts ,
        args =(kwargs ['api_url_input'],kwargs ,num_post_workers ),
        daemon =True ,
        name ="PostFetcher"
        )
        fetcher_thread .start ()
        self .log_signal .emit (f"✅ Post fetcher thread started. {num_post_workers } post worker threads initializing...")
        self._update_button_states_and_connections() # Update buttons after fetcher thread starts

    def _fetch_and_queue_posts (self ,api_url_input_for_fetcher ,worker_args_template ,num_post_workers ):
        global PostProcessorWorker ,download_from_api 
        all_posts_data =[]
        fetch_error_occurred =False 
        manga_mode_active_for_fetch =worker_args_template .get ('manga_mode_active',False )
        emitter_for_worker =worker_args_template .get ('emitter')
       
        is_restore = self.interrupted_session_data is not None
        if is_restore:
            all_posts_data = self.interrupted_session_data['download_state']['all_posts_data']
            processed_ids = set(self.interrupted_session_data['download_state']['processed_post_ids'])
            posts_to_process = [p for p in all_posts_data if p.get('id') not in processed_ids]
            self.log_signal.emit(f"Restoring session. {len(posts_to_process)} posts remaining out of {len(all_posts_data)}.")
            self.total_posts_to_process = len(all_posts_data)
            self.processed_posts_count = len(processed_ids)
            self.overall_progress_signal.emit(self.total_posts_to_process, self.processed_posts_count)
            
            # Re-assign all_posts_data to only what needs processing
            all_posts_data = posts_to_process
       
        if not emitter_for_worker :
            self .log_signal .emit ("❌ CRITICAL ERROR: Emitter (queue) missing for worker in _fetch_and_queue_posts.");
            self .finished_signal .emit (0 ,0 ,True ,[]);
            return 

        try:
            self.log_signal.emit("    Fetching post data from API (this may take a moment for large feeds)...")
            if not is_restore: # Only fetch new data if not restoring
                post_generator = download_from_api(
                    api_url_input_for_fetcher,
                    logger=lambda msg: self.log_signal.emit(f"[Fetcher] {msg}"),
                    start_page=worker_args_template.get('start_page'),
                    end_page=worker_args_template.get('end_page'),
                    manga_mode=manga_mode_active_for_fetch,
                    cancellation_event=self.cancellation_event,
                    pause_event=worker_args_template.get('pause_event'),
                    use_cookie=worker_args_template.get('use_cookie'),
                    cookie_text=worker_args_template.get('cookie_text'),
                    selected_cookie_file=worker_args_template.get('selected_cookie_file'),
                    app_base_dir=worker_args_template.get('app_base_dir'),
                    manga_filename_style_for_sort_check=(
                        worker_args_template.get('manga_filename_style')
                        if manga_mode_active_for_fetch
                        else None
                    )
                )

                for posts_batch in post_generator:
                    if self.cancellation_event.is_set():
                        fetch_error_occurred = True; self.log_signal.emit("    Post fetching cancelled by user."); break
                    if isinstance(posts_batch, list):
                        all_posts_data.extend(posts_batch)
                        self.total_posts_to_process = len(all_posts_data)
                        if self.total_posts_to_process > 0 and self.total_posts_to_process % 100 == 0:
                            self.log_signal.emit(f"    Fetched {self.total_posts_to_process} posts so far...")
                    else:
                        fetch_error_occurred = True; self.log_signal.emit(f"❌ API fetcher returned non-list type: {type(posts_batch)}"); break

                if not fetch_error_occurred and not self.cancellation_event.is_set():
                    self.log_signal.emit(f"✅ Post fetching complete. Total posts to process: {self.total_posts_to_process}")

                # Get a clean, serializable dictionary of UI settings
                output_dir_for_session = worker_args_template.get('output_dir', self.dir_input.text().strip())
                ui_settings_for_session = self._get_current_ui_settings_as_dict(
                    api_url_override=api_url_input_for_fetcher,
                    output_dir_override=output_dir_for_session
                )

                # Save initial session state
                session_data = {
                    "timestamp": datetime.datetime.now().isoformat(),
                    "ui_settings": ui_settings_for_session,
                    "download_state": {
                        "all_posts_data": all_posts_data,
                        "processed_post_ids": []
                    }
                }
                self._save_session_file(session_data)

            # From here, all_posts_data is the list of posts to process (either new or restored)
            unique_posts_dict ={}
            for post in all_posts_data :
                post_id =post .get ('id')
                if post_id is not None :
                    if post_id not in unique_posts_dict :
                        unique_posts_dict [post_id ]=post 
                else :
                    self .log_signal .emit (f"⚠️ Skipping post with no ID: {post .get ('title','Untitled')}")

            posts_to_process_final = list(unique_posts_dict.values())

            if not is_restore:
                self.total_posts_to_process = len(posts_to_process_final)
                self.log_signal.emit(f"    Processed {len(posts_to_process_final)} unique posts after de-duplication.")
                if len(posts_to_process_final) < len(all_posts_data):
                    self.log_signal.emit(f"    Note: {len(all_posts_data) - len(posts_to_process_final)} duplicate post IDs were removed.")
            all_posts_data = posts_to_process_final

        except TypeError as te :
            self .log_signal .emit (f"❌ TypeError calling download_from_api: {te }\n    Check 'downloader_utils.py' signature.\n{traceback .format_exc (limit =2 )}");fetch_error_occurred =True 
        except RuntimeError as re_err :
            self .log_signal .emit (f"ℹ️ Post fetching runtime error (likely cancellation or API issue): {re_err }");fetch_error_occurred =True 
        except Exception as e :
            self .log_signal .emit (f"❌ Error during post fetching: {e }\n{traceback .format_exc (limit =2 )}");fetch_error_occurred =True 

        finally :
            self .is_fetcher_thread_running =False 
            self .log_signal .emit (f"ℹ️ Post fetcher thread (_fetch_and_queue_posts) has completed its task. is_fetcher_thread_running set to False.")

        if self .cancellation_event .is_set ()or fetch_error_occurred :
            self .finished_signal .emit (self .download_counter ,self .skip_counter ,self .cancellation_event .is_set (),self .all_kept_original_filenames )
            if self .thread_pool :self .thread_pool .shutdown (wait =False ,cancel_futures =True );self .thread_pool =None 
            return 

        if not all_posts_data:
            self .log_signal .emit ("😕 No posts found or fetched to process.")
            self .finished_signal .emit (0 ,0 ,False ,[])
            return 

        self .log_signal .emit (f"    Preparing to submit {self .total_posts_to_process } post processing tasks to thread pool...")
        if not is_restore:
            self.processed_posts_count = 0
        self.overall_progress_signal.emit(self.total_posts_to_process, self.processed_posts_count)

        num_file_dl_threads_for_each_worker =worker_args_template .get ('num_file_threads_for_worker',1 )


        ppw_expected_keys =[
        'post_data','download_root','known_names','filter_character_list','unwanted_keywords',
        'filter_mode','skip_zip','skip_rar','use_subfolders','use_post_subfolders',
        'target_post_id_from_initial_url','custom_folder_name','compress_images','emitter','pause_event',
        'download_thumbnails','service','user_id','api_url_input',
        'cancellation_event','downloaded_files','downloaded_file_hashes',
        'downloaded_files_lock','downloaded_file_hashes_lock','remove_from_filename_words_list','dynamic_character_filter_holder',
        'skip_words_list','skip_words_scope','char_filter_scope',
        'show_external_links','extract_links_only','allow_multipart_download','use_cookie','cookie_text',
        'app_base_dir','selected_cookie_file','override_output_dir',
        'num_file_threads','skip_current_file_flag','manga_date_file_counter_ref','scan_content_for_images',
        'manga_mode_active','manga_filename_style','manga_date_prefix',
        'manga_global_file_counter_ref'
        ,'creator_download_folder_ignore_words'
        , 'session_file_path', 'session_lock'
        ]

        ppw_optional_keys_with_defaults ={
        'skip_words_list','skip_words_scope','char_filter_scope','remove_from_filename_words_list',
        'show_external_links','extract_links_only','duplicate_file_mode',
        'num_file_threads','skip_current_file_flag','manga_mode_active','manga_filename_style','manga_date_prefix',
        'manga_date_file_counter_ref','use_cookie','cookie_text','app_base_dir','selected_cookie_file'
        }
        if num_post_workers >POST_WORKER_BATCH_THRESHOLD and self .total_posts_to_process >POST_WORKER_NUM_BATCHES :
            self .log_signal .emit (f"    High thread count ({num_post_workers }) detected. Batching post submissions into {POST_WORKER_NUM_BATCHES } parts.")

            import math 
            tasks_submitted_in_batch_segment =0 
            batch_size =math .ceil (self .total_posts_to_process /POST_WORKER_NUM_BATCHES )
            submitted_count_in_batching =0 

            for batch_num in range (POST_WORKER_NUM_BATCHES ):
                if self .cancellation_event .is_set ():break 

                if self .pause_event and self .pause_event .is_set ():
                    self .log_signal .emit (f"    [Fetcher] Batch submission paused before batch {batch_num +1 }/{POST_WORKER_NUM_BATCHES }...")
                    while self .pause_event .is_set ():
                        if self .cancellation_event .is_set ():
                            self .log_signal .emit ("    [Fetcher] Batch submission cancelled while paused.")
                            break 
                        time .sleep (0.5 )
                    if self .cancellation_event .is_set ():break 
                    if not self .cancellation_event .is_set ():
                        self .log_signal .emit (f"    [Fetcher] Batch submission resumed. Processing batch {batch_num +1 }/{POST_WORKER_NUM_BATCHES }.")

                start_index =batch_num *batch_size 
                end_index =min ((batch_num +1 )*batch_size ,self .total_posts_to_process )
                current_batch_posts =all_posts_data [start_index :end_index ]

                if not current_batch_posts :continue 

                self .log_signal .emit (f"    Submitting batch {batch_num +1 }/{POST_WORKER_NUM_BATCHES } ({len (current_batch_posts )} posts) to pool...")
                for post_data_item in current_batch_posts :
                    if self .cancellation_event .is_set ():break 
                    success =self ._submit_post_to_worker_pool (post_data_item ,worker_args_template ,num_file_dl_threads_for_each_worker ,emitter_for_worker ,ppw_expected_keys ,ppw_optional_keys_with_defaults )
                    if success :
                        submitted_count_in_batching +=1 
                        tasks_submitted_in_batch_segment +=1 
                        if tasks_submitted_in_batch_segment %10 ==0 :
                            time .sleep (0.005 )
                            tasks_submitted_in_batch_segment =0 
                    elif self .cancellation_event .is_set ():
                        break 

                if self .cancellation_event .is_set ():break 

                if batch_num <POST_WORKER_NUM_BATCHES -1 :
                    self .log_signal .emit (f"    Batch {batch_num +1 } submitted. Waiting {POST_WORKER_BATCH_DELAY_SECONDS }s before next batch...")
                    delay_start_time =time .time ()
                    while time .time ()-delay_start_time <POST_WORKER_BATCH_DELAY_SECONDS :
                        if self .cancellation_event .is_set ():break 
                        time .sleep (0.1 )
                    if self .cancellation_event .is_set ():break 

            self .log_signal .emit (f"    All {POST_WORKER_NUM_BATCHES } batches ({submitted_count_in_batching } total tasks) submitted to pool via batching.")

        else :
            self .log_signal .emit (f"    Submitting all {self .total_posts_to_process } tasks to pool directly...")
            submitted_count_direct =0 
            tasks_submitted_since_last_yield =0 
            for post_data_item in all_posts_data :
                if self .cancellation_event .is_set ():break 
                success =self ._submit_post_to_worker_pool (post_data_item ,worker_args_template ,num_file_dl_threads_for_each_worker ,emitter_for_worker ,ppw_expected_keys ,ppw_optional_keys_with_defaults )
                if success :
                    submitted_count_direct +=1 
                    tasks_submitted_since_last_yield +=1 
                    if tasks_submitted_since_last_yield %10 ==0 :
                        time .sleep (0.005 )
                        tasks_submitted_since_last_yield =0 
                elif self .cancellation_event .is_set ():
                    break 

            if not self .cancellation_event .is_set ():
                self .log_signal .emit (f"    All {submitted_count_direct } post processing tasks submitted directly to pool.")

        if self .cancellation_event .is_set ():
            self .log_signal .emit ("    Cancellation detected after/during task submission loop.")

            if self .external_link_download_thread and self .external_link_download_thread .isRunning ():
                self .mega_download_thread .cancel ()


            self .finished_signal .emit (self .download_counter ,self .skip_counter ,True ,self .all_kept_original_filenames )
            if self .thread_pool :self .thread_pool .shutdown (wait =False ,cancel_futures =True );self .thread_pool =None 

    def _handle_future_result (self ,future :Future ):
        self .processed_posts_count +=1 
        downloaded_files_from_future ,skipped_files_from_future =0 ,0 
        kept_originals_from_future =[]
        try :
            if future .cancelled ():
                if not self .cancellation_message_logged_this_session :
                    self .log_signal .emit ("    A post processing task was cancelled.")
                    self .cancellation_message_logged_this_session =True 
            elif future .exception ():
                self .log_signal .emit (f"❌ Post processing worker error: {future .exception ()}")
            else :

                result_tuple =future .result ()
                downloaded_files_from_future ,skipped_files_from_future ,kept_originals_from_future ,retryable_failures_from_post ,permanent_failures_from_post ,history_data_from_worker =result_tuple 
                if history_data_from_worker :
                    self ._add_to_history_candidates (history_data_from_worker )
                if permanent_failures_from_post :
                    self .permanently_failed_files_for_dialog .extend (permanent_failures_from_post )
                    self ._add_to_history_candidates (history_data_from_worker )
            with self .downloaded_files_lock :
                self .download_counter +=downloaded_files_from_future 
                self .skip_counter +=skipped_files_from_future 

            if kept_originals_from_future :
                self .all_kept_original_filenames .extend (kept_originals_from_future )

            self .overall_progress_signal .emit (self .total_posts_to_process ,self .processed_posts_count )
        except Exception as e :
            self .log_signal .emit (f"❌ Error in _handle_future_result callback: {e }\n{traceback .format_exc (limit =2 )}")
            if self .processed_posts_count <self .total_posts_to_process :
                self .processed_posts_count =self .total_posts_to_process 

        if self .total_posts_to_process >0 and self .processed_posts_count >=self .total_posts_to_process :
            if all (f .done ()for f in self .active_futures ):
                QApplication .processEvents ()
                self .log_signal .emit ("🏁 All submitted post tasks have completed or failed.")
                self .finished_signal .emit (self .download_counter ,self .skip_counter ,self .cancellation_event .is_set (),self .all_kept_original_filenames )

    def _add_to_history_candidates (self ,history_data ):
        """Adds processed post data to the history candidates list."""
        if history_data and len (self .download_history_candidates )<8 :
            history_data ['download_date_timestamp']=time .time ()
            creator_key =(history_data .get ('service','').lower (),str (history_data .get ('user_id','')))
            history_data ['creator_name']=self .creator_name_cache .get (creator_key ,history_data .get ('user_id','Unknown'))
            self .download_history_candidates .append (history_data )

    def _finalize_download_history (self ):
        """Processes candidates and selects the final 3 history entries.
        Only updates final_download_history_entries if new candidates are available.
        """
        if not self .download_history_candidates :


            self .log_signal .emit ("ℹ️ No new history candidates from this session. Preserving existing history.")


            self .download_history_candidates .clear ()
            return 

        candidates =list (self .download_history_candidates )
        now =datetime .datetime .now (datetime .timezone .utc )

        def get_sort_key (entry ):
            upload_date_str =entry .get ('upload_date_str')
            if not upload_date_str :
                return datetime .timedelta .max 
            try :

                upload_dt =datetime .datetime .fromisoformat (upload_date_str .replace ('Z','+00:00'))
                if upload_dt .tzinfo is None :
                    upload_dt =upload_dt .replace (tzinfo =datetime .timezone .utc )
                return abs (now -upload_dt )
            except ValueError :
                return datetime .timedelta .max 

        candidates .sort (key =get_sort_key )
        self .final_download_history_entries =candidates [:3 ]
        self .log_signal .emit (f"ℹ️ Finalized download history: {len (self .final_download_history_entries )} entries selected.")
        self .download_history_candidates .clear ()


        self ._save_persistent_history ()

    def _get_configurable_widgets_on_pause (self ):
        """Returns a list of widgets that should be re-enabled when paused."""
        return [
        self .dir_input ,self .dir_button ,
        self .character_input ,self .char_filter_scope_toggle_button ,
        self .skip_words_input ,self .skip_scope_toggle_button ,
        self .remove_from_filename_input ,
        self .radio_all ,self .radio_images ,self .radio_videos ,
        self .radio_only_archives ,self .radio_only_links ,
        self .skip_zip_checkbox ,self .skip_rar_checkbox ,
        self .download_thumbnails_checkbox ,self .compress_images_checkbox ,
        self .use_subfolders_checkbox ,self .use_subfolder_per_post_checkbox ,
        self .manga_mode_checkbox ,
        self .manga_rename_toggle_button ,
        self .cookie_browse_button ,
        self .favorite_mode_checkbox ,
        self .multipart_toggle_button ,
        self .cookie_text_input ,
        self .scan_content_images_checkbox ,
        self .use_cookie_checkbox ,
        self .external_links_checkbox 
        ]

    def set_ui_enabled (self ,enabled ):
        all_potentially_toggleable_widgets =[
        self .link_input ,self .dir_input ,self .dir_button ,
        self .page_range_label ,self .start_page_input ,self .to_label ,self .end_page_input ,
        self .character_input ,self .char_filter_scope_toggle_button ,self .character_filter_widget ,
        self .filters_and_custom_folder_container_widget ,
        self .custom_folder_label ,self .custom_folder_input ,
        self .skip_words_input ,self .skip_scope_toggle_button ,self .remove_from_filename_input ,
        self .radio_all ,self .radio_images ,self .radio_videos ,self .radio_only_archives ,self .radio_only_links ,
        self .skip_zip_checkbox ,self .skip_rar_checkbox ,self .download_thumbnails_checkbox ,self .compress_images_checkbox ,
        self .use_subfolders_checkbox ,self .use_subfolder_per_post_checkbox ,self .scan_content_images_checkbox ,
        self .use_multithreading_checkbox ,self .thread_count_input ,self .thread_count_label ,
        self .favorite_mode_checkbox ,
        self .external_links_checkbox ,self .manga_mode_checkbox ,self .manga_rename_toggle_button ,self .use_cookie_checkbox ,self .cookie_text_input ,self .cookie_browse_button ,
        self .multipart_toggle_button ,self .radio_only_audio ,
        self .character_search_input ,self .new_char_input ,self .add_char_button ,self .add_to_filter_button ,self .delete_char_button ,
        self .reset_button 
        ]

        widgets_to_enable_on_pause =self ._get_configurable_widgets_on_pause ()
        is_fav_mode_active =self .favorite_mode_checkbox .isChecked ()if self .favorite_mode_checkbox else False 
        download_is_active_or_paused =not enabled 

        if not enabled :
            if self .bottom_action_buttons_stack :
                self .bottom_action_buttons_stack .setCurrentIndex (0 )

            if self .external_link_download_thread and self .external_link_download_thread .isRunning ():
                self .log_signal .emit ("ℹ️ Cancelling active Mega download due to UI state change.")
                self .external_link_download_thread .cancel ()
        else :
            pass 


        for widget in all_potentially_toggleable_widgets :
            if not widget :continue 


            if widget is self .favorite_mode_artists_button or widget is self .favorite_mode_posts_button :continue 
            elif self .is_paused and widget in widgets_to_enable_on_pause :
                widget .setEnabled (True )
            elif widget is self .favorite_mode_checkbox :
                widget .setEnabled (enabled )
            elif widget is self .use_cookie_checkbox and is_fav_mode_active :
                widget .setEnabled (False )
            elif widget is self .use_cookie_checkbox and self .is_paused and widget in widgets_to_enable_on_pause :
                widget .setEnabled (True )
            else :
                widget .setEnabled (enabled )

        if self .link_input :
            self .link_input .setEnabled (enabled and not is_fav_mode_active )



        if not enabled :
            if self .favorite_mode_artists_button :
                self .favorite_mode_artists_button .setEnabled (False )
            if self .favorite_mode_posts_button :
                self .favorite_mode_posts_button .setEnabled (False )

        if self .download_btn :
            self .download_btn .setEnabled (enabled and not is_fav_mode_active )


        if self .external_links_checkbox :
            is_only_links =self .radio_only_links and self .radio_only_links .isChecked ()
            is_only_archives =self .radio_only_archives and self .radio_only_archives .isChecked ()
            is_only_audio =hasattr (self ,'radio_only_audio')and self .radio_only_audio .isChecked ()
            can_enable_ext_links =enabled and not is_only_links and not is_only_archives and not is_only_audio 
            self .external_links_checkbox .setEnabled (can_enable_ext_links )
            if self .is_paused and not is_only_links and not is_only_archives and not is_only_audio :
                self .external_links_checkbox .setEnabled (True )
        if hasattr (self ,'use_cookie_checkbox'):
            self ._update_cookie_input_visibility (self .use_cookie_checkbox .isChecked ())

        if self .log_verbosity_toggle_button :self .log_verbosity_toggle_button .setEnabled (True )

        multithreading_currently_on =self .use_multithreading_checkbox .isChecked ()
        if self .thread_count_input :self .thread_count_input .setEnabled (enabled and multithreading_currently_on )
        if self .thread_count_label :self .thread_count_label .setEnabled (enabled and multithreading_currently_on )

        subfolders_currently_on =self .use_subfolders_checkbox .isChecked ()
        if self .use_subfolder_per_post_checkbox :
            self .use_subfolder_per_post_checkbox .setEnabled (enabled or (self .is_paused and self .use_subfolder_per_post_checkbox in widgets_to_enable_on_pause ))
        if self .cancel_btn :self .cancel_btn .setEnabled (download_is_active_or_paused )
        if self .pause_btn :
            self .pause_btn .setEnabled (download_is_active_or_paused )
            if download_is_active_or_paused :
                self .pause_btn .setText (self ._tr ("resume_download_button_text","▶️ Resume Download")if self .is_paused else self ._tr ("pause_download_button_text","⏸️ Pause Download"))
                self .pause_btn .setToolTip (self ._tr ("resume_download_button_tooltip","Click to resume the download.")if self .is_paused else self ._tr ("pause_download_button_tooltip","Click to pause the download."))
            else :
                self .pause_btn .setText (self ._tr ("pause_download_button_text","⏸️ Pause Download"))
                self .pause_btn .setToolTip (self ._tr ("pause_download_button_tooltip","Click to pause the ongoing download process."))
                self .is_paused =False 
        if self .cancel_btn :self .cancel_btn .setText (self ._tr ("cancel_button_text","❌ Cancel & Reset UI"))
        if enabled :
            if self .pause_event :self .pause_event .clear ()
        if enabled or self .is_paused :
            self ._handle_multithreading_toggle (multithreading_currently_on )
            self .update_ui_for_manga_mode (self .manga_mode_checkbox .isChecked ()if self .manga_mode_checkbox else False )
            self .update_custom_folder_visibility (self .link_input .text ())
            self .update_page_range_enabled_state ()
            if self .radio_group and self .radio_group .checkedButton ():
                self ._handle_filter_mode_change (self .radio_group .checkedButton (),True )
            self .update_ui_for_subfolders (subfolders_currently_on )
            self ._handle_favorite_mode_toggle (is_fav_mode_active )

    def _handle_pause_resume_action (self ):
        if self ._is_download_active ():
            self .is_paused =not self .is_paused 
            if self .is_paused :
                if self .pause_event :self .pause_event .set ()
                self .log_signal .emit ("ℹ️ Download paused by user. Some settings can now be changed for subsequent operations.")
            else :
                if self .pause_event :self .pause_event .clear ()
                self .log_signal .emit ("ℹ️ Download resumed by user.")
            self .set_ui_enabled (False )

    def _perform_soft_ui_reset (self ,preserve_url =None ,preserve_dir =None ):
        """Resets UI elements and some state to app defaults, then applies preserved inputs."""
        self .log_signal .emit ("🔄 Performing soft UI reset...")
        self .link_input .clear ()
        self .dir_input .clear ()
        self .custom_folder_input .clear ();self .character_input .clear ();
        self .skip_words_input .clear ();self .start_page_input .clear ();self .end_page_input .clear ();self .new_char_input .clear ();
        if hasattr (self ,'remove_from_filename_input'):self .remove_from_filename_input .clear ()
        self .character_search_input .clear ();self .thread_count_input .setText ("4");self .radio_all .setChecked (True );
        self .skip_zip_checkbox .setChecked (True );self .skip_rar_checkbox .setChecked (True );self .download_thumbnails_checkbox .setChecked (False );
        self .compress_images_checkbox .setChecked (False );self .use_subfolders_checkbox .setChecked (True );
        self .use_subfolder_per_post_checkbox .setChecked (False );self .use_multithreading_checkbox .setChecked (True );
        if self .favorite_mode_checkbox :self .favorite_mode_checkbox .setChecked (False )
        if hasattr (self ,'scan_content_images_checkbox'):self .scan_content_images_checkbox .setChecked (False )
        self .external_links_checkbox .setChecked (False )
        if self .manga_mode_checkbox :self .manga_mode_checkbox .setChecked (False )
        if hasattr (self ,'use_cookie_checkbox'):self .use_cookie_checkbox .setChecked (self .use_cookie_setting )
        if not (hasattr (self ,'use_cookie_checkbox')and self .use_cookie_checkbox .isChecked ()):
            self .selected_cookie_filepath =None 
        if hasattr (self ,'cookie_text_input'):self .cookie_text_input .setText (self .cookie_text_setting if self .use_cookie_setting else "")
        self .allow_multipart_download_setting =False 
        self ._update_multipart_toggle_button_text ()

        self .skip_words_scope =SKIP_SCOPE_POSTS 
        self ._update_skip_scope_button_text ()

        if hasattr (self ,'manga_date_prefix_input'):self .manga_date_prefix_input .clear ()

        self .char_filter_scope =CHAR_SCOPE_TITLE 
        self ._update_char_filter_scope_button_text ()

        self .manga_filename_style =STYLE_POST_TITLE 
        self ._update_manga_filename_style_button_text ()
        if preserve_url is not None :
            self .link_input .setText (preserve_url )
        if preserve_dir is not None :
            self .dir_input .setText (preserve_dir )
        self .external_link_queue .clear ();self .extracted_links_cache =[]
        self ._is_processing_external_link_queue =False ;self ._current_link_post_title =None 
        if self .pause_event :self .pause_event .clear ()
        self.is_restore_pending = False
        self .total_posts_to_process =0 ;self .processed_posts_count =0 
        self .download_counter =0 ;self .skip_counter =0 
        self .all_kept_original_filenames =[]
        self .is_paused =False 
        self ._handle_multithreading_toggle (self .use_multithreading_checkbox .isChecked ())
     
        self._update_button_states_and_connections() # Reset button states and connections
        self .favorite_download_queue .clear ()
        self .is_processing_favorites_queue =False 

        self .only_links_log_display_mode =LOG_DISPLAY_LINKS 

        if hasattr (self ,'link_input'):
            if self .download_extracted_links_button :
                self .download_extracted_links_button .setEnabled (False )

            self .last_link_input_text_for_queue_sync =self .link_input .text ()
        self .permanently_failed_files_for_dialog .clear ()
        self .filter_character_list (self .character_search_input .text ())
        self .favorite_download_scope =FAVORITE_SCOPE_SELECTED_LOCATION 
        self ._update_favorite_scope_button_text ()

        self .set_ui_enabled (True )
        self.interrupted_session_data = None # Clear session data from memory      
        self .update_custom_folder_visibility (self .link_input .text ())
        self .update_page_range_enabled_state ()
        self ._update_cookie_input_visibility (self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False )
        if hasattr (self ,'favorite_mode_checkbox'):
            self ._handle_favorite_mode_toggle (False )

        self .log_signal .emit ("✅ Soft UI reset complete. Preserved URL and Directory (if provided).")

    def _update_log_display_mode_button_text (self ):
        if hasattr (self ,'log_display_mode_toggle_button'):
            if self .only_links_log_display_mode ==LOG_DISPLAY_LINKS :
                self .log_display_mode_toggle_button .setText (self ._tr ("log_display_mode_links_view_text","🔗 Links View"))
                self .log_display_mode_toggle_button .setToolTip (
                "Current View: Extracted Links.\n"
                "After Mega download, Mega log is shown THEN links are appended.\n"
                "Click to switch to 'Download Progress View'."
                )
            else :
                self .log_display_mode_toggle_button .setText (self ._tr ("log_display_mode_progress_view_text","⬇️ Progress View"))
                self .log_display_mode_toggle_button .setToolTip (
                "Current View: Mega Download Progress.\n"
                "After Mega download, ONLY Mega log is shown (links hidden).\n"
                "Click to switch to 'Extracted Links View'."
                )

    def _toggle_log_display_mode (self ):
        self .only_links_log_display_mode =LOG_DISPLAY_DOWNLOAD_PROGRESS if self .only_links_log_display_mode ==LOG_DISPLAY_LINKS else LOG_DISPLAY_LINKS 
        self ._update_log_display_mode_button_text ()
        self ._filter_links_log ()

    def cancel_download_button_action (self ):
        if not self .cancel_btn .isEnabled ()and not self .cancellation_event .is_set ():self .log_signal .emit ("ℹ️ No active download to cancel or already cancelling.");return 
        self .log_signal .emit ("⚠️ Requesting cancellation of download process (soft reset)...")

        self._clear_session_file() # Clear session file on explicit cancel
        if self .external_link_download_thread and self .external_link_download_thread .isRunning ():
            self .log_signal .emit ("    Cancelling active External Link download thread...")
            self .external_link_download_thread .cancel ()

        current_url =self .link_input .text ()
        current_dir =self .dir_input .text ()

        self .cancellation_event .set ()
        self .is_fetcher_thread_running =False 
        if self .download_thread and self .download_thread .isRunning ():self .download_thread .requestInterruption ();self .log_signal .emit ("    Signaled single download thread to interrupt.")
        if self .thread_pool :
            self .log_signal .emit ("    Initiating non-blocking shutdown and cancellation of worker pool tasks...")
            self .thread_pool .shutdown (wait =False ,cancel_futures =True )
            self .thread_pool =None 
            self .active_futures =[]

        self .external_link_queue .clear ();self ._is_processing_external_link_queue =False ;self ._current_link_post_title =None 

        self ._perform_soft_ui_reset (preserve_url =current_url ,preserve_dir =current_dir )

        self .progress_label .setText (f"{self ._tr ('status_cancelled_by_user','Cancelled by user')}. {self ._tr ('ready_for_new_task_text','Ready for new task.')}")
        self .file_progress_label .setText ("")
        if self .pause_event :self .pause_event .clear ()
        self .log_signal .emit ("ℹ️ UI reset. Ready for new operation. Background tasks are being terminated.")
        self .is_paused =False 
        if hasattr (self ,'retryable_failed_files_info')and self .retryable_failed_files_info :
            self .log_signal .emit (f"    Discarding {len (self .retryable_failed_files_info )} pending retryable file(s) due to cancellation.")
            self .cancellation_message_logged_this_session =False 
            self .retryable_failed_files_info .clear ()
        self .favorite_download_queue .clear ()
        self .permanently_failed_files_for_dialog .clear ()
        self .is_processing_favorites_queue =False 
        self .favorite_download_scope =FAVORITE_SCOPE_SELECTED_LOCATION 
        self ._update_favorite_scope_button_text ()
        if hasattr (self ,'link_input'):
            self .last_link_input_text_for_queue_sync =self .link_input .text ()
        self .cancellation_message_logged_this_session =False 

    def _get_domain_for_service (self ,service_name :str )->str :
        """Determines the base domain for a given service."""
        if not isinstance (service_name ,str ):
            return "kemono.su"
        service_lower =service_name .lower ()
        coomer_primary_services ={'onlyfans','fansly','manyvids','candfans','gumroad','patreon','subscribestar','dlsite','discord','fantia','boosty','pixiv','fanbox'}
        if service_lower in coomer_primary_services and service_lower not in ['patreon','discord','fantia','boosty','pixiv','fanbox']:
            return "coomer.su"
        return "kemono.su"

    def download_finished (self ,total_downloaded ,total_skipped ,cancelled_by_user ,kept_original_names_list =None ):
        if kept_original_names_list is None :
            kept_original_names_list =list (self .all_kept_original_filenames )if hasattr (self ,'all_kept_original_filenames')else []
        if kept_original_names_list is None :
            kept_original_names_list =[]

        if not cancelled_by_user and not self.retryable_failed_files_info:
            self._clear_session_file()
            self.interrupted_session_data = None
            self.is_restore_pending = False

        self ._finalize_download_history ()
        status_message =self ._tr ("status_cancelled_by_user","Cancelled by user")if cancelled_by_user else self ._tr ("status_completed","Completed")
        if cancelled_by_user and self .retryable_failed_files_info :
            self .log_signal .emit (f"    Download cancelled, discarding {len (self .retryable_failed_files_info )} file(s) that were pending retry.")
            self .retryable_failed_files_info .clear ()

        summary_log ="="*40 
        summary_log +=f"\n🏁 Download {status_message }!\n    Summary: Downloaded Files={total_downloaded }, Skipped Files={total_skipped }\n"
        summary_log +="="*40 
        self .log_signal .emit (summary_log )

        if kept_original_names_list :
            intro_msg =(
            HTML_PREFIX +
            "<p>ℹ️ The following files from multi-file manga posts "
            "(after the first file) kept their <b>original names</b>:</p>"
            )
            self .log_signal .emit (intro_msg )

            html_list_items ="<ul>"
            for name in kept_original_names_list :
                html_list_items +=f"<li><b>{name }</b></li>"
            html_list_items +="</ul>"

            self .log_signal .emit (HTML_PREFIX +html_list_items )
            self .log_signal .emit ("="*40 )

        if self .download_thread :
            try :
                if hasattr (self .download_thread ,'progress_signal'):self .download_thread .progress_signal .disconnect (self .handle_main_log )
                if hasattr (self .download_thread ,'add_character_prompt_signal'):self .download_thread .add_character_prompt_signal .disconnect (self .add_character_prompt_signal )
                if hasattr (self .download_thread ,'finished_signal'):self .download_thread .finished_signal .disconnect (self .download_finished )
                if hasattr (self .download_thread ,'receive_add_character_result'):self .character_prompt_response_signal .disconnect (self .download_thread .receive_add_character_result )
                if hasattr (self .download_thread ,'external_link_signal'):self .download_thread .external_link_signal .disconnect (self .handle_external_link_signal )
                if hasattr (self .download_thread ,'file_progress_signal'):self .download_thread .file_progress_signal .disconnect (self .update_file_progress_display )
                if hasattr (self .download_thread ,'missed_character_post_signal'):
                    self .download_thread .missed_character_post_signal .disconnect (self .handle_missed_character_post )
                if hasattr (self .download_thread ,'retryable_file_failed_signal'):
                    self .download_thread .retryable_file_failed_signal .disconnect (self ._handle_retryable_file_failure )
                if hasattr (self .download_thread ,'file_successfully_downloaded_signal'):
                    self .download_thread .file_successfully_downloaded_signal .disconnect (self ._handle_actual_file_downloaded )
                if hasattr (self .download_thread ,'post_processed_for_history_signal'):
                    self .download_thread .post_processed_for_history_signal .disconnect (self ._add_to_history_candidates )
            except (TypeError ,RuntimeError )as e :
                self .log_signal .emit (f"ℹ️ Note during single-thread signal disconnection: {e }")

            if not self .download_thread .isRunning ():

                if self .download_thread :
                    self .download_thread .deleteLater ()
                self .download_thread =None 

        self .progress_label .setText (
        f"{status_message }: "
        f"{total_downloaded } {self ._tr ('files_downloaded_label','downloaded')}, "
        f"{total_skipped } {self ._tr ('files_skipped_label','skipped')}."
        )
        self .file_progress_label .setText ("")
        if not cancelled_by_user :self ._try_process_next_external_link ()

        if self .thread_pool :
            self .log_signal .emit ("    Ensuring worker thread pool is shut down...")
            self .thread_pool .shutdown (wait =True ,cancel_futures =True )
            self .thread_pool =None 

        self .active_futures =[]
        if self .pause_event :self .pause_event .clear ()
        self .cancel_btn .setEnabled (False )
        self .is_paused =False 
        if not cancelled_by_user and self .retryable_failed_files_info :
            num_failed =len (self .retryable_failed_files_info )
            reply =QMessageBox .question (self ,"Retry Failed Downloads?",
            f"{num_failed } file(s) failed with potentially recoverable errors (e.g., IncompleteRead).\n\n"
            "Would you like to attempt to download these failed files again?",
            QMessageBox .Yes |QMessageBox .No ,QMessageBox .Yes )
            if reply ==QMessageBox .Yes :
                self ._start_failed_files_retry_session ()
                return 
            else :
                self .log_signal .emit ("ℹ️ User chose not to retry failed files.")
                self .permanently_failed_files_for_dialog .extend (self .retryable_failed_files_info )
                if self .permanently_failed_files_for_dialog :
                    self .log_signal .emit (f"🆘 Error button enabled. {len (self .permanently_failed_files_for_dialog )} file(s) can be viewed.")
                self .cancellation_message_logged_this_session =False 
                self .retryable_failed_files_info .clear ()

        self .is_fetcher_thread_running =False 

        if self .is_processing_favorites_queue :
            if not self .favorite_download_queue :
                self .is_processing_favorites_queue =False 
                self .log_signal .emit (f"✅ All {self .current_processing_favorite_item_info .get ('type','item')} downloads from favorite queue have been processed.")
                self .set_ui_enabled (not self ._is_download_active ())
            else :
                self ._process_next_favorite_download ()
        else :
            self .set_ui_enabled (True )
        self .cancellation_message_logged_this_session =False 

    def _handle_thumbnail_mode_change (self ,thumbnails_checked ):
        """Handles UI changes when 'Download Thumbnails Only' is toggled."""
        if not hasattr (self ,'scan_content_images_checkbox'):
            return 

        if thumbnails_checked :
            self .scan_content_images_checkbox .setChecked (True )
            self .scan_content_images_checkbox .setEnabled (False )
            self .scan_content_images_checkbox .setToolTip (
            "Automatically enabled and locked because 'Download Thumbnails Only' is active.\n"
            "In this mode, only images found by content scanning will be downloaded."
            )
        else :
            self .scan_content_images_checkbox .setEnabled (True )
            self .scan_content_images_checkbox .setChecked (False )
            self .scan_content_images_checkbox .setToolTip (self ._original_scan_content_tooltip )

    def _start_failed_files_retry_session (self ,files_to_retry_list =None ):
        if files_to_retry_list :
            self .files_for_current_retry_session =list (files_to_retry_list )
            self .permanently_failed_files_for_dialog =[f for f in self .permanently_failed_files_for_dialog if f not in files_to_retry_list ]
        else :
            self .files_for_current_retry_session =list (self .retryable_failed_files_info )
            self .retryable_failed_files_info .clear ()
        self .log_signal .emit (f"🔄 Starting retry session for {len (self .files_for_current_retry_session )} file(s)...")
        self .set_ui_enabled (False )
        if self .cancel_btn :self .cancel_btn .setText (self ._tr ("cancel_retry_button_text","❌ Cancel Retry"))


        self .active_retry_futures =[]
        self .processed_retry_count =0 
        self .succeeded_retry_count =0 
        self .failed_retry_count_in_session =0 
        self .total_files_for_retry =len (self .files_for_current_retry_session )
        self .active_retry_futures_map ={}

        self .progress_label .setText (self ._tr ("progress_posts_text","Progress: {processed_posts} / {total_posts} posts ({progress_percent:.1f}%)").format (processed_posts =0 ,total_posts =self .total_files_for_retry ,progress_percent =0.0 ).replace ("posts","files"))
        self .cancellation_event .clear ()

        num_retry_threads =1 
        try :
            num_threads_from_gui =int (self .thread_count_input .text ().strip ())
            num_retry_threads =max (1 ,min (num_threads_from_gui ,MAX_FILE_THREADS_PER_POST_OR_WORKER ,self .total_files_for_retry if self .total_files_for_retry >0 else 1 ))
        except ValueError :
            num_retry_threads =1 

        self .retry_thread_pool =ThreadPoolExecutor (max_workers =num_retry_threads ,thread_name_prefix ='RetryFile_')
        common_ppw_args_for_retry ={
        'download_root':self .dir_input .text ().strip (),
        'known_names':list (KNOWN_NAMES ),
        'emitter':self .worker_to_gui_queue ,
        'unwanted_keywords':{'spicy','hd','nsfw','4k','preview','teaser','clip'},
        'filter_mode':self .get_filter_mode (),
        'skip_zip':self .skip_zip_checkbox .isChecked (),
        'skip_rar':self .skip_rar_checkbox .isChecked (),
        'use_subfolders':self .use_subfolders_checkbox .isChecked (),
        'use_post_subfolders':self .use_subfolder_per_post_checkbox .isChecked (),
        'compress_images':self .compress_images_checkbox .isChecked (),
        'download_thumbnails':self .download_thumbnails_checkbox .isChecked (),
        'pause_event':self .pause_event ,
        'cancellation_event':self .cancellation_event ,
        'downloaded_files':self .downloaded_files ,
        'downloaded_file_hashes':self .downloaded_file_hashes ,
        'downloaded_files_lock':self .downloaded_files_lock ,
        'downloaded_file_hashes_lock':self .downloaded_file_hashes_lock ,
        'skip_words_list':[word .strip ().lower ()for word in self .skip_words_input .text ().strip ().split (',')if word .strip ()],
        'skip_words_scope':self .get_skip_words_scope (),
        'char_filter_scope':self .get_char_filter_scope (),
        'remove_from_filename_words_list':[word .strip ()for word in self .remove_from_filename_input .text ().strip ().split (',')if word .strip ()]if hasattr (self ,'remove_from_filename_input')else [],
        'allow_multipart_download':self .allow_multipart_download_setting ,
        'filter_character_list':None ,
        'dynamic_character_filter_holder':None ,
        'target_post_id_from_initial_url':None ,
        'custom_folder_name':None ,
        'num_file_threads':1 ,
        'manga_date_file_counter_ref':None ,
        }

        for job_details in self .files_for_current_retry_session :
            future =self .retry_thread_pool .submit (self ._execute_single_file_retry ,job_details ,common_ppw_args_for_retry )
            future .add_done_callback (self ._handle_retry_future_result )
            self .active_retry_futures_map [future ]=job_details 
            self .active_retry_futures .append (future )

    def _execute_single_file_retry (self ,job_details ,common_args ):
        """Executes a single file download retry attempt."""
        dummy_post_data ={'id':job_details ['original_post_id_for_log'],'title':job_details ['post_title']}

        ppw_init_args ={
        **common_args ,
        'post_data':dummy_post_data ,
        'service':job_details .get ('service','unknown_service'),
        'user_id':job_details .get ('user_id','unknown_user'),
        'api_url_input':job_details .get ('api_url_input',''),
        'manga_mode_active':job_details .get ('manga_mode_active_for_file',False ),
        'manga_filename_style':job_details .get ('manga_filename_style_for_file',STYLE_POST_TITLE ),
        'scan_content_for_images':common_args .get ('scan_content_for_images',False ),
        'use_cookie':common_args .get ('use_cookie',False ),
        'cookie_text':common_args .get ('cookie_text',""),
        'selected_cookie_file':common_args .get ('selected_cookie_file',None ),
        'app_base_dir':common_args .get ('app_base_dir',None ),
        }
        worker =PostProcessorWorker (**ppw_init_args )

        dl_count ,skip_count ,filename_saved ,original_kept ,status ,_ =worker ._download_single_file (
        file_info =job_details ['file_info'],
        target_folder_path =job_details ['target_folder_path'],
        headers =job_details ['headers'],
        original_post_id_for_log =job_details ['original_post_id_for_log'],
        skip_event =None ,
        post_title =job_details ['post_title'],
        file_index_in_post =job_details ['file_index_in_post'],
        num_files_in_this_post =job_details ['num_files_in_this_post'],
        forced_filename_override =job_details .get ('forced_filename_override')
        )



        is_successful_download =(status ==FILE_DOWNLOAD_STATUS_SUCCESS )
        is_resolved_as_skipped =(status ==FILE_DOWNLOAD_STATUS_SKIPPED )

        return is_successful_download or is_resolved_as_skipped 

    def _handle_retry_future_result (self ,future ):
        self .processed_retry_count +=1 
        was_successful =False 
        try :
            if future .cancelled ():
                self .log_signal .emit ("    A retry task was cancelled.")
            elif future .exception ():
                self .log_signal .emit (f"❌ Retry task worker error: {future .exception ()}")
            else :
                was_successful =future .result ()
                job_details =self .active_retry_futures_map .pop (future ,None )
                if was_successful :
                    self .succeeded_retry_count +=1 
                else :
                    self .failed_retry_count_in_session +=1 
                    if job_details :
                        self .permanently_failed_files_for_dialog .append (job_details )
        except Exception as e :
            self .log_signal .emit (f"❌ Error in _handle_retry_future_result: {e }")
            self .failed_retry_count_in_session +=1 

        progress_percent_retry =(self .processed_retry_count /self .total_files_for_retry *100 )if self .total_files_for_retry >0 else 0 
        self .progress_label .setText (
        self ._tr ("progress_posts_text","Progress: {processed_posts} / {total_posts} posts ({progress_percent:.1f}%)").format (processed_posts =self .processed_retry_count ,total_posts =self .total_files_for_retry ,progress_percent =progress_percent_retry ).replace ("posts","files")+
        f" ({self ._tr ('succeeded_text','Succeeded')}: {self .succeeded_retry_count }, {self ._tr ('failed_text','Failed')}: {self .failed_retry_count_in_session })"
        )

        if self .processed_retry_count >=self .total_files_for_retry :
            if all (f .done ()for f in self .active_retry_futures ):
                QTimer .singleShot (0 ,self ._retry_session_finished )


    def _retry_session_finished (self ):
        self .log_signal .emit ("🏁 Retry session finished.")
        self .log_signal .emit (f"    Summary: {self .succeeded_retry_count } Succeeded, {self .failed_retry_count_in_session } Failed.")

        if self .retry_thread_pool :
            self .retry_thread_pool .shutdown (wait =True )
            self .retry_thread_pool =None 

        if self .external_link_download_thread and not self .external_link_download_thread .isRunning ():
            self .external_link_download_thread .deleteLater ()
            self .external_link_download_thread =None 

        self .active_retry_futures .clear ()
        self .active_retry_futures_map .clear ()
        self .files_for_current_retry_session .clear ()

        if self .permanently_failed_files_for_dialog :
            self .log_signal .emit (f"🆘 {self ._tr ('error_button_text','Error')} button enabled. {len (self .permanently_failed_files_for_dialog )} file(s) ultimately failed and can be viewed.")

        self .set_ui_enabled (not self ._is_download_active ())
        if self .cancel_btn :self .cancel_btn .setText (self ._tr ("cancel_button_text","❌ Cancel & Reset UI"))
        self .progress_label .setText (
        f"{self ._tr ('retry_finished_text','Retry Finished')}. "
        f"{self ._tr ('succeeded_text','Succeeded')}: {self .succeeded_retry_count }, "
        f"{self ._tr ('failed_text','Failed')}: {self .failed_retry_count_in_session }. "
        f"{self ._tr ('ready_for_new_task_text','Ready for new task.')}")
        self .file_progress_label .setText ("")
        if self .pause_event :self .pause_event .clear ()
        self .is_paused =False 

    def toggle_active_log_view (self ):
        if self .current_log_view =='progress':
            self .current_log_view ='missed_character'
            if self .log_view_stack :self .log_view_stack .setCurrentIndex (1 )
            if self .log_verbosity_toggle_button :
                self .log_verbosity_toggle_button .setText (self .CLOSED_EYE_ICON )
                self .log_verbosity_toggle_button .setToolTip ("Current View: Missed Character Log. Click to switch to Progress Log.")
            if self .progress_log_label :self .progress_log_label .setText (self ._tr ("missed_character_log_label_text","🚫 Missed Character Log:"))
        else :
            self .current_log_view ='progress'
            if self .log_view_stack :self .log_view_stack .setCurrentIndex (0 )
            if self .log_verbosity_toggle_button :
                self .log_verbosity_toggle_button .setText (self .EYE_ICON )
                self .log_verbosity_toggle_button .setToolTip ("Current View: Progress Log. Click to switch to Missed Character Log.")
            if self .progress_log_label :self .progress_log_label .setText (self ._tr ("progress_log_label_text","📜 Progress Log:"))

    def reset_application_state(self):
        # --- Stop all background tasks and threads ---
        if self._is_download_active():
            # Try to cancel download thread
            if self.download_thread and self.download_thread.isRunning():
                self.log_signal.emit("⚠️ Cancelling active download thread for reset...")
                self.cancellation_event.set()
                self.download_thread.requestInterruption()
                self.download_thread.wait(3000)
                if self.download_thread.isRunning():
                    self.log_signal.emit("   ⚠️ Download thread did not terminate gracefully.")
                self.download_thread.deleteLater()
                self.download_thread = None
    
            # Try to cancel thread pool
            if self.thread_pool:
                self.log_signal.emit("   Shutting down thread pool for reset...")
                self.thread_pool.shutdown(wait=True, cancel_futures=True)
                self.thread_pool = None
                self.active_futures = []
    
            # Try to cancel external link download thread
            if self.external_link_download_thread and self.external_link_download_thread.isRunning():
                self.log_signal.emit("   Cancelling external link download thread for reset...")
                self.external_link_download_thread.cancel()
                self.external_link_download_thread.wait(3000)
                self.external_link_download_thread.deleteLater()
                self.external_link_download_thread = None
    
            # Try to cancel retry thread pool
            if hasattr(self, 'retry_thread_pool') and self.retry_thread_pool:
                self.log_signal.emit("   Shutting down retry thread pool for reset...")
                self.retry_thread_pool.shutdown(wait=True)
                self.retry_thread_pool = None
                if hasattr(self, 'active_retry_futures'):
                    self.active_retry_futures.clear()
                if hasattr(self, 'active_retry_futures_map'):
                    self.active_retry_futures_map.clear()
    
            self.cancellation_event.clear()
            if self.pause_event:
                self.pause_event.clear()
            self.is_paused = False
    
        # --- Reset UI and all state ---
        self.log_signal.emit("🔄 Resetting application state to defaults...")
        self._reset_ui_to_defaults()
        self.main_log_output.clear()
        self.external_log_output.clear()
        if self.missed_character_log_output:
            self.missed_character_log_output.clear()
    
        self.current_log_view = 'progress'
        if self.log_view_stack:
            self.log_view_stack.setCurrentIndex(0)
        if self.progress_log_label:
            self.progress_log_label.setText(self._tr("progress_log_label_text", "📜 Progress Log:"))
        if self.log_verbosity_toggle_button:
            self.log_verbosity_toggle_button.setText(self.EYE_ICON)
            self.log_verbosity_toggle_button.setToolTip("Current View: Progress Log. Click to switch to Missed Character Log.")
    
        # Clear all download-related state
        self.external_link_queue.clear()
        self.extracted_links_cache = []
        self._is_processing_external_link_queue = False
        self._current_link_post_title = None
        self.progress_label.setText(self._tr("progress_idle_text", "Progress: Idle"))
        self.file_progress_label.setText("")
        with self.downloaded_files_lock:
            self.downloaded_files.clear()
        with self.downloaded_file_hashes_lock:
            self.downloaded_file_hashes.clear()
        self.missed_title_key_terms_count.clear()
        self.missed_title_key_terms_examples.clear()
        self.logged_summary_for_key_term.clear()
        self.already_logged_bold_key_terms.clear()
        self.missed_key_terms_buffer.clear()
        self.favorite_download_queue.clear()
        self.only_links_log_display_mode = LOG_DISPLAY_LINKS
        self.mega_download_log_preserved_once = False
        self.permanently_failed_files_for_dialog.clear()
        self.favorite_download_scope = FAVORITE_SCOPE_SELECTED_LOCATION
        self._update_favorite_scope_button_text()
        self.retryable_failed_files_info.clear()
        self.cancellation_message_logged_this_session = False
        self.is_processing_favorites_queue = False
        self.total_posts_to_process = 0
        self.processed_posts_count = 0
        self.download_counter = 0
        self.skip_counter = 0
        self.all_kept_original_filenames = []
        self.is_paused = False
        self.is_fetcher_thread_running = False
        self.interrupted_session_data = None
        self.is_restore_pending = False
    
        self.settings.setValue(MANGA_FILENAME_STYLE_KEY, self.manga_filename_style)
        self.settings.setValue(SKIP_WORDS_SCOPE_KEY, self.skip_words_scope)
        self.settings.sync()
        self._update_manga_filename_style_button_text()
        self.update_ui_for_manga_mode(self.manga_mode_checkbox.isChecked() if self.manga_mode_checkbox else False)
    
        self.set_ui_enabled(True)
        self.log_signal.emit("✅ Application fully reset. Ready for new download.")
        self.is_processing_favorites_queue = False
        self.current_processing_favorite_item_info = None
        self.favorite_download_queue.clear()
        self.interrupted_session_data = None
        self.is_restore_pending = False
        self.last_link_input_text_for_queue_sync = ""    
    # Replace your current reset_application_state with the above.

    def _reset_ui_to_defaults(self):
        """Resets all UI elements and relevant state to their default values."""
        # Clear all text fields
        self.link_input.clear()
        self.dir_input.clear()
        self.custom_folder_input.clear()
        self.character_input.clear()
        self.skip_words_input.clear()
        self.start_page_input.clear()
        self.end_page_input.clear()
        self.new_char_input.clear()
        if hasattr(self, 'remove_from_filename_input'):
            self.remove_from_filename_input.clear()
        self.character_search_input.clear()
        self.thread_count_input.setText("4")
        if hasattr(self, 'manga_date_prefix_input'):
            self.manga_date_prefix_input.clear()
    
        # Set radio buttons and checkboxes to defaults
        self.radio_all.setChecked(True)
        self.skip_zip_checkbox.setChecked(True)
        self.skip_rar_checkbox.setChecked(True)
        self.download_thumbnails_checkbox.setChecked(False)
        self.compress_images_checkbox.setChecked(False)
        self.use_subfolders_checkbox.setChecked(True)
        self.use_subfolder_per_post_checkbox.setChecked(False)
        self.use_multithreading_checkbox.setChecked(True)
        if self.favorite_mode_checkbox:
            self.favorite_mode_checkbox.setChecked(False)
        self.external_links_checkbox.setChecked(False)
        if self.manga_mode_checkbox:
            self.manga_mode_checkbox.setChecked(False)
        if hasattr(self, 'use_cookie_checkbox'):
            self.use_cookie_checkbox.setChecked(False)
        self.selected_cookie_filepath = None
        if hasattr(self, 'cookie_text_input'):
            self.cookie_text_input.clear()
    
        # Reset log and progress displays
        if self.main_log_output:
            self.main_log_output.clear()
        if self.external_log_output:
            self.external_log_output.clear()
        if self.missed_character_log_output:
            self.missed_character_log_output.clear()
        self.progress_label.setText(self._tr("progress_idle_text", "Progress: Idle"))
        self.file_progress_label.setText("")
    
        # Reset internal state
        self.missed_title_key_terms_count.clear()
        self.missed_title_key_terms_examples.clear()
        self.logged_summary_for_key_term.clear()
        self.already_logged_bold_key_terms.clear()
        self.missed_key_terms_buffer.clear()
        self.permanently_failed_files_for_dialog.clear()
        self.only_links_log_display_mode = LOG_DISPLAY_LINKS
        self.cancellation_message_logged_this_session = False
        self.mega_download_log_preserved_once = False
        self.allow_multipart_download_setting = False
        self.skip_words_scope = SKIP_SCOPE_POSTS
        self.char_filter_scope = CHAR_SCOPE_TITLE
        self.manga_filename_style = STYLE_POST_TITLE
        self.favorite_download_scope = FAVORITE_SCOPE_SELECTED_LOCATION
        self._update_skip_scope_button_text()
        self._update_char_filter_scope_button_text()
        self._update_manga_filename_style_button_text()
        self._update_multipart_toggle_button_text()
        self._update_favorite_scope_button_text()
        self.current_log_view = 'progress'
        self.is_paused = False
        if self.pause_event:
            self.pause_event.clear()
    
        # Reset extracted/external links state
        self.external_link_queue.clear()
        self.extracted_links_cache = []
        self._is_processing_external_link_queue = False
        self._current_link_post_title = None
        if self.download_extracted_links_button:
            self.download_extracted_links_button.setEnabled(False)
    
        # Reset favorite/queue/session state
        self.favorite_download_queue.clear()
        self.is_processing_favorites_queue = False
        self.current_processing_favorite_item_info = None
        self.interrupted_session_data = None
        self.is_restore_pending = False
        self.last_link_input_text_for_queue_sync = ""
        self._update_button_states_and_connections()
        # Reset counters and progress
        self.total_posts_to_process = 0
        self.processed_posts_count = 0
        self.download_counter = 0
        self.skip_counter = 0
        self.all_kept_original_filenames = []
    
        # Reset log view and UI state
        if self.log_view_stack:
            self.log_view_stack.setCurrentIndex(0)
        if self.progress_log_label:
            self.progress_log_label.setText(self._tr("progress_log_label_text", "📜 Progress Log:"))
        if self.log_verbosity_toggle_button:
            self.log_verbosity_toggle_button.setText(self.EYE_ICON)
            self.log_verbosity_toggle_button.setToolTip("Current View: Progress Log. Click to switch to Missed Character Log.")
    
        # Reset character list filter
        self.filter_character_list("")
    
        # Update UI for manga mode and multithreading
        self._handle_multithreading_toggle(self.use_multithreading_checkbox.isChecked())
        self.update_ui_for_manga_mode(False)
        self.update_custom_folder_visibility(self.link_input.text())
        self.update_page_range_enabled_state()
        self._update_cookie_input_visibility(False)
        self._update_cookie_input_placeholders_and_tooltips()
    
        # Reset button states
        self.download_btn.setEnabled(True)
        self.cancel_btn.setEnabled(False)
        if self.reset_button:
            self.reset_button.setEnabled(True)
            self.reset_button.setText(self._tr("reset_button_text", "🔄 Reset"))
            self.reset_button.setToolTip(self._tr("reset_button_tooltip", "Reset all inputs and logs to default state (only when idle)."))
    
        # Reset favorite mode UI
        if hasattr(self, 'favorite_mode_checkbox'):
            self._handle_favorite_mode_toggle(False)
        if hasattr(self, 'scan_content_images_checkbox'):
            self.scan_content_images_checkbox.setChecked(False)
        if hasattr(self, 'download_thumbnails_checkbox'):
            self._handle_thumbnail_mode_change(self.download_thumbnails_checkbox.isChecked())
    
        self.set_ui_enabled(True)
        self.log_signal.emit("✅ UI reset to defaults. Ready for new operation.")
        self._update_button_states_and_connections()
        
    def _show_feature_guide (self ):
        steps_content_keys =[
        ("help_guide_step1_title","help_guide_step1_content"),
        ("help_guide_step2_title","help_guide_step2_content"),
        ("help_guide_step3_title","help_guide_step3_content"),
        ("help_guide_step4_title","help_guide_step4_content"),
        ("help_guide_step5_title","help_guide_step5_content"),
        ("help_guide_step6_title","help_guide_step6_content"),
        ("help_guide_step7_title","help_guide_step7_content"),
        ("help_guide_step8_title","help_guide_step8_content"),
        ("help_guide_step9_title","help_guide_step9_content"),
        ("column_header_post_title","Post Title"),
        ("column_header_date_uploaded","Date Uploaded"),
        ]

        steps =[
        ]
        for title_key ,content_key in steps_content_keys :
            title =self ._tr (title_key ,title_key )
            content =self ._tr (content_key ,f"Content for {content_key } not found.")
            steps .append ((title ,content ))

        guide_dialog =HelpGuideDialog (steps ,self )
        guide_dialog .exec_ ()

    def prompt_add_character (self ,character_name ):
        global KNOWN_NAMES 
        reply =QMessageBox .question (self ,"Add Filter Name to Known List?",f"The name '{character_name }' was encountered or used as a filter.\nIt's not in your known names list (used for folder suggestions).\nAdd it now?",QMessageBox .Yes |QMessageBox .No ,QMessageBox .Yes )
        result =(reply ==QMessageBox .Yes )
        if result :
            if self .add_new_character (name_to_add =character_name ,
            is_group_to_add =False ,
            aliases_to_add =[character_name ],
            suppress_similarity_prompt =False ):
                self .log_signal .emit (f"✅ Added '{character_name }' to known names via background prompt.")
            else :result =False ;self .log_signal .emit (f"ℹ️ Adding '{character_name }' via background prompt was declined, failed, or a similar name conflict was not overridden.")
        self .character_prompt_response_signal .emit (result )

    def receive_add_character_result (self ,result ):
        with QMutexLocker (self .prompt_mutex ):self ._add_character_response =result 
        self .log_signal .emit (f"    Main thread received character prompt response: {'Action resulted in addition/confirmation'if result else 'Action resulted in no addition/declined'}")

    def _update_multipart_toggle_button_text (self ):
        if hasattr (self ,'multipart_toggle_button'):
            if self .allow_multipart_download_setting :
                self .multipart_toggle_button .setText (self ._tr ("multipart_on_button_text","Multi-part: ON"))
                self .multipart_toggle_button .setToolTip (self ._tr ("multipart_on_button_tooltip","Tooltip for multipart ON"))
            else :
                self .multipart_toggle_button .setText (self ._tr ("multipart_off_button_text","Multi-part: OFF"))
                self .multipart_toggle_button .setToolTip (self ._tr ("multipart_off_button_tooltip","Tooltip for multipart OFF"))

    def _toggle_multipart_mode (self ):
        if not self .allow_multipart_download_setting :
            msg_box =QMessageBox (self )
            msg_box .setIcon (QMessageBox .Warning )
            msg_box .setWindowTitle ("Multi-part Download Advisory")
            msg_box .setText (
            "<b>Multi-part download advisory:</b><br><br>"
            "<ul>"
            "<li>Best suited for <b>large files</b> (e.g., single post videos).</li>"
            "<li>When downloading a full creator feed with many small files (like images):"
            "<ul><li>May not offer significant speed benefits.</li>"
            "<li>Could potentially make the UI feel <b>choppy</b>.</li>"
            "<li>May <b>spam the process log</b> with rapid, numerous small download messages.</li></ul></li>"
            "<li>Consider using the <b>'Videos' filter</b> if downloading a creator feed to primarily target large files for multi-part.</li>"
            "</ul><br>"
            "Do you want to enable multi-part download?"
            )
            proceed_button =msg_box .addButton ("Proceed Anyway",QMessageBox .AcceptRole )
            cancel_button =msg_box .addButton ("Cancel",QMessageBox .RejectRole )
            msg_box .setDefaultButton (proceed_button )
            msg_box .exec_ ()

            if msg_box .clickedButton ()==cancel_button :
                self .log_signal .emit ("ℹ️ Multi-part download enabling cancelled by user.")
                return 

        self .allow_multipart_download_setting =not self .allow_multipart_download_setting 
        self ._update_multipart_toggle_button_text ()
        self .settings .setValue (ALLOW_MULTIPART_DOWNLOAD_KEY ,self .allow_multipart_download_setting )
        self .log_signal .emit (f"ℹ️ Multi-part download set to: {'Enabled'if self .allow_multipart_download_setting else 'Disabled'}")

    def _open_known_txt_file (self ):
        if not os .path .exists (self .config_file ):
            QMessageBox .warning (self ,"File Not Found",
            f"The file 'Known.txt' was not found at:\n{self .config_file }\n\n"
            "It will be created automatically when you add a known name or close the application.")
            self .log_signal .emit (f"ℹ️ 'Known.txt' not found at {self .config_file }. It will be created later.")
            return 

        try :
            if sys .platform =="win32":
                os .startfile (self .config_file )
            elif sys .platform =="darwin":
                subprocess .call (['open',self .config_file ])
            else :
                subprocess .call (['xdg-open',self .config_file ])
            self .log_signal .emit (f"ℹ️ Attempted to open '{os .path .basename (self .config_file )}' with the default editor.")
        except FileNotFoundError :
            QMessageBox .critical (self ,"Error",f"Could not find '{os .path .basename (self .config_file )}' at {self .config_file } to open it.")
            self .log_signal .emit (f"❌ Error: '{os .path .basename (self .config_file )}' not found at {self .config_file } when trying to open.")
        except Exception as e :
            QMessageBox .critical (self ,"Error Opening File",f"Could not open '{os .path .basename (self .config_file )}':\n{e }")
            self .log_signal .emit (f"❌ Error opening '{os .path .basename (self .config_file )}': {e }")

    def _show_add_to_filter_dialog (self ):
        global KNOWN_NAMES 
        if not KNOWN_NAMES :
            QMessageBox .information (self ,"No Known Names","Your 'Known.txt' list is empty. Add some names first.")
            return 

        dialog =KnownNamesFilterDialog (KNOWN_NAMES ,self ,self )
        if dialog .exec_ ()==QDialog .Accepted :
            selected_entries =dialog .get_selected_entries ()
            if selected_entries :
                self ._add_names_to_character_filter_input (selected_entries )

    def _add_names_to_character_filter_input (self ,selected_entries ):
        """
        Adds the selected known name entries to the character filter input field.
        """
        if not selected_entries :
            return 

        names_to_add_str_list =[]
        for entry in selected_entries :
            if entry .get ("is_group"):
                aliases_str =", ".join (entry .get ("aliases",[]))
                names_to_add_str_list .append (f"({aliases_str })~")
            else :
                names_to_add_str_list .append (entry .get ("name",""))

        names_to_add_str_list =[s for s in names_to_add_str_list if s ]

        if not names_to_add_str_list :
            return 

        current_filter_text =self .character_input .text ().strip ()
        new_text_to_append =", ".join (names_to_add_str_list )

        self .character_input .setText (f"{current_filter_text }, {new_text_to_append }"if current_filter_text else new_text_to_append )
        self .log_signal .emit (f"ℹ️ Added to character filter: {new_text_to_append }")

    def _update_favorite_scope_button_text (self ):
        if not hasattr (self ,'favorite_scope_toggle_button')or not self .favorite_scope_toggle_button :
            return 
        if self .favorite_download_scope ==FAVORITE_SCOPE_SELECTED_LOCATION :
            self .favorite_scope_toggle_button .setText (self ._tr ("favorite_scope_selected_location_text","Scope: Selected Location"))

        elif self .favorite_download_scope ==FAVORITE_SCOPE_ARTIST_FOLDERS :
            self .favorite_scope_toggle_button .setText (self ._tr ("favorite_scope_artist_folders_text","Scope: Artist Folders"))

        else :
            self .favorite_scope_toggle_button .setText (self ._tr ("favorite_scope_unknown_text","Scope: Unknown"))


    def _cycle_favorite_scope (self ):
        if self .favorite_download_scope ==FAVORITE_SCOPE_SELECTED_LOCATION :
            self .favorite_download_scope =FAVORITE_SCOPE_ARTIST_FOLDERS 
        else :
            self .favorite_download_scope =FAVORITE_SCOPE_SELECTED_LOCATION 
        self ._update_favorite_scope_button_text ()
        self .log_signal .emit (f"ℹ️ Favorite download scope changed to: '{self .favorite_download_scope }'")

    def _show_empty_popup (self ):
        """Creates and shows the empty popup dialog."""
        if self.is_restore_pending:
            QMessageBox.information(self, self._tr("restore_pending_title", "Restore Pending"),
                                    self._tr("restore_pending_message_creator_selection",
                                             "Please 'Restore Download' or 'Discard Session' before selecting new creators."))
            return

        dialog =EmptyPopupDialog (self .app_base_dir ,self ,self )
        if dialog .exec_ ()==QDialog .Accepted :
            if hasattr (dialog ,'selected_creators_for_queue')and dialog .selected_creators_for_queue :
                self .favorite_download_queue .clear ()

                for creator_data in dialog .selected_creators_for_queue :
                    service =creator_data .get ('service')
                    creator_id =creator_data .get ('id')
                    creator_name =creator_data .get ('name','Unknown Creator')
                    domain =dialog ._get_domain_for_service (service )

                    if service and creator_id :
                        url =f"https://{domain }/{service }/user/{creator_id }"
                        queue_item ={
                        'url':url ,
                        'name':creator_name ,
                        'name_for_folder':creator_name ,
                        'type':'creator_popup_selection',
                        'scope_from_popup':dialog .current_scope_mode 
                        }
                        self .favorite_download_queue .append (queue_item )

                if self .favorite_download_queue :
                    self .log_signal .emit (f"ℹ️ {len (self .favorite_download_queue )} creators added to download queue from popup. Click 'Start Download' to process.")
                    if hasattr (self ,'link_input'):
                        self .last_link_input_text_for_queue_sync =self .link_input .text ()

    def _show_favorite_artists_dialog (self ):
        if self ._is_download_active ()or self .is_processing_favorites_queue :
            QMessageBox .warning (self ,"Busy","Another download operation is already in progress.")
            return 

        cookies_config ={
        'use_cookie':self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False ,
        'cookie_text':self .cookie_text_input .text ()if hasattr (self ,'cookie_text_input')else "",
        'selected_cookie_file':self .selected_cookie_filepath ,
        'app_base_dir':self .app_base_dir 
        }

        dialog =FavoriteArtistsDialog (self ,cookies_config )
        if dialog .exec_ ()==QDialog .Accepted :
            selected_artists =dialog .get_selected_artists ()
            if selected_artists :
                if len (selected_artists )>1 and self .link_input :
                    display_names =", ".join ([artist ['name']for artist in selected_artists ])
                    if self .link_input :
                        self .link_input .clear ()
                        self .link_input .setPlaceholderText (f"{len (selected_artists )} favorite artists selected for download queue.")
                    self .log_signal .emit (f"ℹ️ Multiple favorite artists selected. Displaying names: {display_names }")
                elif len (selected_artists )==1 :
                    self .link_input .setText (selected_artists [0 ]['url'])
                    self .log_signal .emit (f"ℹ️ Single favorite artist selected: {selected_artists [0 ]['name']}")

                self .log_signal .emit (f"ℹ️ Queuing {len (selected_artists )} favorite artist(s) for download.")
                for artist_data in selected_artists :
                    self .favorite_download_queue .append ({'url':artist_data ['url'],'name':artist_data ['name'],'name_for_folder':artist_data ['name'],'type':'artist'})

                if not self .is_processing_favorites_queue :
                    self ._process_next_favorite_download ()
            else :
                self .log_signal .emit ("ℹ️ No favorite artists were selected for download.")
                QMessageBox .information (self ,
                self ._tr ("fav_artists_no_selection_title","No Selection"),
                self ._tr ("fav_artists_no_selection_message","Please select at least one artist to download."))
        else :
            self .log_signal .emit ("ℹ️ Favorite artists selection cancelled.")

    def _show_favorite_posts_dialog (self ):
        if self ._is_download_active ()or self .is_processing_favorites_queue :
            QMessageBox .warning (self ,"Busy","Another download operation is already in progress.")
            return 

        cookies_config ={
        'use_cookie':self .use_cookie_checkbox .isChecked ()if hasattr (self ,'use_cookie_checkbox')else False ,
        'cookie_text':self .cookie_text_input .text ()if hasattr (self ,'cookie_text_input')else "",
        'selected_cookie_file':self .selected_cookie_filepath ,
        'app_base_dir':self .app_base_dir 
        }
        global KNOWN_NAMES 

        target_domain_preference_for_fetch =None 

        if cookies_config ['use_cookie']:
            self .log_signal .emit ("Favorite Posts: 'Use Cookie' is checked. Determining target domain...")
            kemono_cookies =prepare_cookies_for_request (
            cookies_config ['use_cookie'],
            cookies_config ['cookie_text'],
            cookies_config ['selected_cookie_file'],
            cookies_config ['app_base_dir'],
            lambda msg :self .log_signal .emit (f"[FavPosts Cookie Check - Kemono] {msg }"),
            target_domain ="kemono.su"
            )
            coomer_cookies =prepare_cookies_for_request (
            cookies_config ['use_cookie'],
            cookies_config ['cookie_text'],
            cookies_config ['selected_cookie_file'],
            cookies_config ['app_base_dir'],
            lambda msg :self .log_signal .emit (f"[FavPosts Cookie Check - Coomer] {msg }"),
            target_domain ="coomer.su"
            )

            kemono_ok =bool (kemono_cookies )
            coomer_ok =bool (coomer_cookies )

            if kemono_ok and not coomer_ok :
                target_domain_preference_for_fetch ="kemono.su"
                self .log_signal .emit ("  ↳ Only Kemono.su cookies loaded. Will fetch favorites from Kemono.su only.")
            elif coomer_ok and not kemono_ok :
                target_domain_preference_for_fetch ="coomer.su"
                self .log_signal .emit ("  ↳ Only Coomer.su cookies loaded. Will fetch favorites from Coomer.su only.")
            elif kemono_ok and coomer_ok :
                target_domain_preference_for_fetch =None 
                self .log_signal .emit ("  ↳ Cookies for both Kemono.su and Coomer.su loaded. Will attempt to fetch from both.")
            else :
                self .log_signal .emit ("  ↳ No valid cookies loaded for Kemono.su or Coomer.su.")
                cookie_help_dialog =CookieHelpDialog (self ,self )
                cookie_help_dialog .exec_ ()
                return 
        else :
            self .log_signal .emit ("Favorite Posts: 'Use Cookie' is NOT checked. Cookies are required.")
            cookie_help_dialog =CookieHelpDialog (self ,self )
            cookie_help_dialog .exec_ ()
            return 

        dialog =FavoritePostsDialog (self ,cookies_config ,KNOWN_NAMES ,target_domain_preference_for_fetch )
        if dialog .exec_ ()==QDialog .Accepted :
            selected_posts =dialog .get_selected_posts ()
            if selected_posts :
                self .log_signal .emit (f"ℹ️ Queuing {len (selected_posts )} favorite post(s) for download.")
                for post_data in selected_posts :
                    domain =self ._get_domain_for_service (post_data ['service'])
                    direct_post_url =f"https://{domain }/{post_data ['service']}/user/{str (post_data ['creator_id'])}/post/{str (post_data ['post_id'])}"

                    queue_item ={
                    'url':direct_post_url ,
                    'name':post_data ['title'],
                    'name_for_folder':post_data ['creator_name_resolved'],
                    'type':'post'
                    }
                    self .favorite_download_queue .append (queue_item )

                if not self .is_processing_favorites_queue :
                    self ._process_next_favorite_download ()
            else :
                self .log_signal .emit ("ℹ️ No favorite posts were selected for download.")
        else :
            self .log_signal .emit ("ℹ️ Favorite posts selection cancelled.")

    def _process_next_favorite_download (self ):
        if self ._is_download_active ():
            self .log_signal .emit ("ℹ️ Waiting for current download to finish before starting next favorite.")
            return 
        if not self .favorite_download_queue :
            if self .is_processing_favorites_queue :
                self .is_processing_favorites_queue =False 
                item_type_log ="item"
                if hasattr (self ,'current_processing_favorite_item_info')and self .current_processing_favorite_item_info :
                    item_type_log =self .current_processing_favorite_item_info .get ('type','item')
                self .log_signal .emit (f"✅ All {item_type_log } downloads from favorite queue have been processed.")
                self .set_ui_enabled (True )
            return 
        if not self .is_processing_favorites_queue :
            self .is_processing_favorites_queue =True 
        self .current_processing_favorite_item_info =self .favorite_download_queue .popleft ()
        next_url =self .current_processing_favorite_item_info ['url']
        item_display_name =self .current_processing_favorite_item_info .get ('name','Unknown Item')

        item_type =self .current_processing_favorite_item_info .get ('type','artist')
        self .log_signal .emit (f"▶️ Processing next favorite from queue: '{item_display_name }' ({next_url })")

        override_dir =None 
        item_scope =self .current_processing_favorite_item_info .get ('scope_from_popup')
        if item_scope is None :
            item_scope =self .favorite_download_scope 

        main_download_dir =self .dir_input .text ().strip ()

        should_create_artist_folder =False 
        if item_type =='creator_popup_selection'and item_scope ==EmptyPopupDialog .SCOPE_CREATORS :
            should_create_artist_folder =True 
        elif item_type !='creator_popup_selection'and self .favorite_download_scope ==FAVORITE_SCOPE_ARTIST_FOLDERS :
            should_create_artist_folder =True 

        if should_create_artist_folder and main_download_dir :
            folder_name_key =self .current_processing_favorite_item_info .get ('name_for_folder','Unknown_Folder')
            item_specific_folder_name =clean_folder_name (folder_name_key )
            override_dir =os .path .normpath (os .path .join (main_download_dir ,item_specific_folder_name ))
            self .log_signal .emit (f"    Scope requires artist folder. Target directory: '{override_dir }'")

        success_starting_download =self .start_download (direct_api_url =next_url ,override_output_dir =override_dir )

        if not success_starting_download :
            self .log_signal .emit (f"⚠️ Failed to initiate download for '{item_display_name }'. Skipping this item in queue.")
            self .download_finished (total_downloaded =0 ,total_skipped =1 ,cancelled_by_user =True ,kept_original_names_list =[])

class ExternalLinkDownloadThread (QThread ):
    """A QThread to handle downloading multiple external links sequentially."""
    progress_signal =pyqtSignal (str )
    file_complete_signal =pyqtSignal (str ,bool )
    finished_signal =pyqtSignal ()

    def __init__ (self ,tasks_to_download ,download_base_path ,parent_logger_func ,parent =None ):
        super ().__init__ (parent )
        self .tasks =tasks_to_download 
        self .download_base_path =download_base_path 
        self .parent_logger_func =parent_logger_func 
        self .is_cancelled =False 

    def run (self ):
        self .progress_signal .emit (f"ℹ️ Starting external link download thread for {len (self .tasks )} link(s).")
        for i ,task_info in enumerate (self .tasks ):
            if self .is_cancelled :
                self .progress_signal .emit ("External link download cancelled by user.")
                break 

            platform =task_info .get ('platform','unknown').lower ()
            full_mega_url =task_info ['url']
            post_title =task_info ['title']
            key =task_info .get ('key','')

            self .progress_signal .emit (f"Download ({i +1 }/{len (self .tasks )}): Starting '{post_title }' ({platform .upper ()}) from {full_mega_url }")

            try :
                if platform =='mega':

                    if key :
                        parsed_original_url =urlparse (full_mega_url )
                        if key not in parsed_original_url .fragment :
                            base_url_no_fragment =full_mega_url .split ('#')[0 ]
                            full_mega_url_with_key =f"{base_url_no_fragment }#{key }"
                            self .progress_signal .emit (f"   Adjusted Mega URL with key: {full_mega_url_with_key }")
                        else :
                            full_mega_url_with_key =full_mega_url 
                    else :
                        full_mega_url_with_key =full_mega_url 
                    drive_download_mega_file (full_mega_url_with_key ,self .download_base_path ,logger_func =self .parent_logger_func )
                elif platform =='google drive':
                    download_gdrive_file (full_mega_url ,self .download_base_path ,logger_func =self .parent_logger_func )
                elif platform =='dropbox':
                    download_dropbox_file (full_mega_url ,self .download_base_path ,logger_func =self .parent_logger_func )
                else :
                    self .progress_signal .emit (f"⚠️ Unsupported platform '{platform }' for link: {full_mega_url }")
                    self .file_complete_signal .emit (full_mega_url ,False )
                    continue 
                self .file_complete_signal .emit (full_mega_url ,True )
            except Exception as e :
                self .progress_signal .emit (f"❌ Error downloading ({platform .upper ()}) link '{full_mega_url }' (from post '{post_title }'): {e }")
                self .file_complete_signal .emit (full_mega_url ,False )
        self .finished_signal .emit ()

    def cancel (self ):
        self .is_cancelled =True